Wanpaku Sandwich わんぱくサンド

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  • Meet the newest and hottest style of sandwich from Japan – Wanpaku Sandwich or Wanpaku Sando for short. Stuffed with colorful vegetables and layering ingredients, these solid Japanese sandwiches present endless possibilities! Probably one of the epic sandwiches I’ve ever made.

    Colorful thick Japanese sandwich, Wanpaku Sandiwch (Sando), shows the filling and piles up on the table.

    Have you seen pictures of these ultimate sandwiches on social media that they don’t look like they would fit in your mouth? Let me introduce to you – Wanpaku Sando (わんぱくサンド) or Wanpaku Sandwich, the hottest sandwich trend that has been around in Japan since 2016.

    The glorious stacks of colorful layers and varying textures from meat, cheese, eggs, and fresh veggies all tucked in the pillowy Japanese bread shokupan waiting for you to take a big bite. These have to be the best-looking sandwiches around.

    You know you have to make them now. But wait, don’t forget to Instagram your creation and share it with #justonecookbook #わんぱくサンド!

    Watch How to Make Wanpaku Sandwich

    Meet the newest and hottest style of sandwich from Japan – Wanpaku Sandwich or Wanpaku Sando for short. Stuffed with colorful vegetables and layering ingredients, these solid Japanese sandwiches present endless possibilities!

    What is Wanpaku Sandwich (Sando)?

    “Wanpaku Sando” or Wanpaku Sandwich became hugely popular around 2016 in Japan. The word Wanpaku is often used to describe an energetic and mischievous or a cheeky person (especially a child), typically used in an affectionate way, like a rascal.

    I tried to look up on the internet on why this type of sandwiches is called “Wanpaku Sando”; but there weren’t many articles about it.  From the look of these bright, colorful, and mouthful sandwiches, no doubt they live up to the description of energetic and mischievous as if they were making cheeky faces.

    Wanpaku Sando wasn’t the first sandwich that triggered such a craze on social media.  A similar thick sandwich had received similar attention on Instagram back in 2015 or even before that. This thick sandwich with shredded cabbage is called Numasan (#沼サン on Instagram).

    It follows the story of Yuki Onuma, a wife of a potter Michiyuki Onuma (aka Numao called by his wife), who makes the thick sandwich for her husband, which she named Numasan (a part of their last name “Numa” and “San” from sandwich). She had been sharing pictures of her Numasan on Instagram years before Wanpaku Sando became popular.

    Yuki has been making this sandwich for more than 10 years after she got married to her husband. He was actually the original creator of this sandwich filled with lots of cabbage because he wanted to eat more vegetables and cabbage was available all-year-around, easy to find, and inexpensive.

    Have you seen or made super thick sandwiches like these?

    A basket containing 3 kinds of thick colorful Japanese sandwich, Wanpaku Sandiwch (Sando).

    How to Build A Perfect Wanpaku Sando (Sandwich)

    Making sandwiches may seem like the easiest task to tackle, but an artful sandwich like Wanpaku Sandwich does require some skills and practice. Here are some of my tips on how to make the perfect Wanpaku sandwich:

    1. Think colors: Choose 4 to 5 ingredients with varied colors

    When you make Wanpaku Sandwich, the focus is on the cross-section. When you cut the sandwich in half, the cross section should reveal colorful ingredients filled between the slices of bread.  My recommendation is to pick four to five colorful ingredients including red, orange, yellow, green, purple, and white!  See below for some ingredient ideas.

    2. Ingredient composition: Flat ingredients toward the bottom, big ingredients in the middle, and flexible ingredients toward the top

    Everyone makes their sandwiches differently, but my trick for a solid sandwich is to start from the flat ingredients – lettuce, tomato slices, cucumber slices, deli meats, cheese, and bacon – so you can level the ingredients easily as you pile them up.

    When you put a big ingredient such as a boiled egg, put it in the middle of the layers. Then on top of the big ingredient, you will need more flexible ingredients such as shredded cabbage or carrot salad to fill in the gap created by the big ingredient.

    3. Color composition: Alternate the bright and the dark-colored ingredients, avoid similar color next to each other

    Just like art-making, the color composition also plays a big part in making sandwiches like this. The cross-section of the sandwich should showcase the range of colorful ingredients. If you use a few green or red ingredients, make sure each color alternate, so it will at least look green, red, some other color, green, red in that order.

    4. Visualization: Pay attention to the cross-section before building

    It’s important to decide what ingredient is the center of the sandwich. If I use a boiled egg, I make sure to put in the center/middle of the sandwich.  If you have some “feature” ingredient, make sure that comes in the middle too!

    For a sturdy sandwich, you need to pay close attention to the cross-section. Before you start building the sandwich, which direction are you going to slice the bread? You need to lay down the ingredient based on the orientation of the cross-section.  That way, when you slice the bread in half, you will see the avocado nicely stacked up, or the egg yolk of the fried egg is perfectly cut in half.

    5. Wrap the sandwich as tightly as possible

    It’s so important to wrap this thick sandwich properly; otherwise, the ingredients may slide out while wrapping, or pop out easily when you’re eating the sandwich.

    In the recipe, I will show you three wrapping methods; with plastic wrap (more flexible), parchment paper (pretty), and both (for beginners but want the parchment paper look).

    A basket containing a thick colorful Japanese sandwich called Wanpaku Sandiwch (Sando).

    Use of Japanese milk bread (Shokupan)

    To make a hefty sandwich like Wanpaku Sandwich, the best choice of bread is thick, soft bread like Japanese milk bread, Shokupan.

    Shokupan (食パン) is a white and pillowy square-shaped milk bread with a soft crust.  The texture is soft yet bouncy, and it’s a common everyday toast for breakfast in Japan.

    Japanese or Asian (Korean/Chinese) grocery stores sell this type of square-shaped milk bread. For Wanpaku Sandwich, we need shokupan which thickness is around 1.8 to 2 cm (3/4 inch).

    In Japan, shokupan is sold in a package of 4, 5, 6, 8, and 10 slices per loaf (with some regional preference on thickness).  I’d go with the package with 6 slices.

    If you can’t find shokupan in your area, you can use bagels or thick slices of bread. One day I’ll share a homemade shokupan recipe!

    A basket containing 3 kinds of thick colorful Japanese sandwiches called Wanpaku Sandiwch (Sando).

    Various Fillings for Wanpaku Sandwich

    Don’t feel limited to the fillings I used in this recipe.  You can pretty much fill in anything you like. In Japan, you can even find Kinpira Gobo, a traditional salad being stuffed into the sandwich! Here are some suggestions:

    • Asparagus
    • Avocado
    • Baby spinach
    • Bacon
    • Cabbage (red or regular)
    • Canned tuna
    • Carrot
    • (Cherry) tomatoes
    • Cucumber
    • Deli meat (ham, turkey, etc)
    • Edamame
    • Egg (boiled/fried)
    • Grilled chicken
    • Kabocha (cooked)
    • Lettuce
    • Okras
    • Tonkatsu/chicken katsu


    • BBQ sauce
    • Japanese mayonnaise
    • Mustard
    • Salad dressings
    • Tonkatsu sauce
    • Your favorite spread

    No matter how you make these Wanpaku Sandwiches, you know they would be great! Enjoy!

    Colorful thick Japanese sandwich, Wanpaku Sandiwch (Sando), shows the filling and piles up on the table.

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    5 from 9 votes
    Colorful thick Japanese sandwich, Wanpaku Sandiwch (Sando), shows the filling and piles up on the table.
    Wanpaku Sandwich
    Prep Time
    40 mins
    Cook Time
    10 mins
    1 hr
    Total Time
    50 mins

    Meet the newest and hottest style of sandwich from Japan - Wanpaku Sandwich or Wanpaku Sando for short. Stuffed with colorful vegetables and layering ingredients, these solid Japanese sandwiches present endless possibilities!

    Course: Main Course
    Cuisine: Japanese
    Keyword: sandwich
    Servings: 3 thick sandwiches
    Grated Carrot Salad (Carottes Râpées)
    • 2 carrots
    • 1 tsp kosher/sea salt (I use Diamond Crystal; Use half for table salt)
    • 1 Tbsp white wine vinegar
    • 2 Tbsp olive oil
    • ¼ tsp sugar
    • freshly ground black pepper
    Tuna Salad
    • 1 canned tuna
    • 3 Tbsp Japanese mayonnaise
    • freshly ground black pepper
    • pinch kosher/sea salt (I use Diamond Crystal; Use half for table salt)
    Mayo & Mustard Spread
    Everything Else
    • ½ Tbsp extra virgin olive oil
    • 2 large eggs
    • ½ English cucumber
    • 2 tomatoes
    • ¼ red cabbage
    • 1 avocado
    • 1 head green leaf lettuce
    • 6 slices toast (Use Japanese toast (shokupan) – a package comes with 6 slices)
    • 2 slices ham
    • 2 slices turkey
    • 2 pieces Tonkatsu (I used Crispy tonkatsu – See Notes)
    • Tonkatsu sauce
    1. Gather all the ingredients. You will also need plastic wrap or parchment paper (and some paper clips).

      Wanpaku Sandwich Ingredients
    To Make Grated Carrot Salad (Carottes Râpées)
    1. Peel the carrot. Cut carrots into a fine julienne with the julienne blade of a mandolin, peeler, or a sharp knife. Cut in half or thirds if your carrot is long.
      Wanpaku Sandwich 1
    2. Sprinkle carrots with 1 tsp kosher salt and rub and mix with hands.
      Wanpaku Sandwich 2
    3. To make the vinaigrette, combine 1 Tbsp white wine vinegar, 2 Tbsp olive oil, ¼ tsp sugar, and freshly ground black pepper, stirring with a whisk.
      Wanpaku Sandwich 3
    4. Add the vinaigrette to carrot mixture and toss to coat. Cover and let stand for 1 hour.
      Wanpaku Sandwich 4
    To Make Fried Egg or Boiled Egg
    1. Heat ½ Tbsp olive oil over medium heat in a frying pan. Crack an egg to make a fried egg as you like. Set aside.

      Wanpaku Sandwich 5
    2. In a pot of boiling water, gently place the egg you just took out of the refrigerator. Cook the egg on gently simmering water for 9 minutes. Transfer the egg to iced water to let cool. Peel the shell and set aside.

      Wanpaku Sandwich 6
    To Make Tuna Salad
    1. Drain the oil/water from canned tuna (if there is any), and season the tuna with Japanese mayonnaise. For this Japanese brand canned tuna, I used 3 Tbsp of mayo.
      Wanpaku Sandwich 7
    2. Sprinkle the tuna with freshly ground black pepper and mix well. Taste and add a little bit of salt if necessary.
      Wanpaku Sandwich 8
    To Prepare Sliced Cucumbers
    1. Peel the cucumber with a peeler. If you’re using an English cucumber or American cucumber, stop peeling when you see seeds. Seeds get too watery in the sandwich, so just eat the center and don’t put inside the sandwich.
      Wanpaku Sandwich 9
    2. On a sheet of paper towel, place the cucumber slices to remove excess moisture.
    To Prepare Sliced Tomatoes
    1. Slice the tomatoes and place on top of a sheet of paper towel and remove excess moisture.
    To Prepare Sliced Cabbage
    1. Thinly shred red cabbage with a cabbage slicer or a sharp knife.
      Wanpaku Sandwich 12
    To Prepare Sliced Avocados
    1. Cut the avocado in half lengthwise around the seed and twist to open. Hack the knife edge into the pit. Hold the skin of avocado with the other hand and twist in counter direction. The pit will come out smoothly.
      Wanpaku Sandwich 13
    2. Cut the avocado into quarters. Remove the skin and cut them lengthwise into quarter inch slices. Clean your hands and knife with damp towel before working on another quarter.
    To Prepare Lettuce
    1. Carefully detach the lettuce leaf and rinse well. Again, carefully remove the excess moisture with paper towel.
    To Prepare Mayo & Mustard Spread
    1. In a small bowl, combine 4 Tbsp Japanese mayonnaise and add 1 tsp Dijon mustard, stirring with a spatula.
    To Assemble Sandwich: Option 1 - Plastic Wrap Method
    1. Prepare a large sheet of plastic wrap. The plastic wrap should be wide enough to fit 4 toasts. Now have a mental note that you will be slicing sandwich WIDTHWISE (slice in the same direction as the scissor indicates).
      Wanpaku Sandwich 17
    2. Spread the mayo & mustard mixture on the bottom and top slices.
      Wanpaku Sandwich 18
    3. Place the bottom toast in the center of the plastic wrap. I start with lettuce, tomatoes, and cucumber. You can start with any ingredients you like. Remember the tips I mentioned in the blog post. Flat ingredients should be at the bottom and flexible ingredients should be higher on the top.

      Wanpaku Sandwich 19
    4. Fold and place the ham and turkey slices on top, and then fried egg and avocado slices. Keep in mind the “cut” line is WIDTHWISE. You have to always imagine how the cut line would look like.
      Wanpaku Sandwich 20
    5. Put the grated carrot salad on top, followed by shredded cabbage and finally a lettuce leaf on top.
      Wanpaku Sandwich 21
    6. Put the toast on top, mayo & mustard side facing down. Gently press down the toast with one hand and lift one side of plastic wrap to wrap around tightly. Gently and slowly pull down the plastic wrap as you go over the sandwich. This helps to tighten the sandwich and prevent the ingredients from falling off. 

      Wanpaku Sandwich 22
    7. When the plastic wrap reaches to the other side of the sandwich, pull the other side of the plastic wrap, going over the sandwich and wrap around the sandwich so the seam line will be on the bottom of the sandwich. Now close the opening area by tightly wrapping around.
      Wanpaku Sandwich 23
    8. Do the same for the other opening areas. Set aside for 5-10 minutes.

      Wanpaku Sandwich 24
    9. Using a clean and sharp knife (I use a bread knife), cut the sandwich in half along the “cut” line.

      Wanpaku Sandwich 25
    To Assemble Sandwich: Option 2 – Parchment Paper Method
    1. Prepare a large sheet of parchment paper; it should be wide enough to fit 4 toasts. Follow exactly as the first sandwich above, but with thin tonkatsu (pork cutlet). Smear the mayo & mustard spread, followed by lettuce and the grated carrot salad.
      Wanpaku Sandwich 26
    2. Next, sliced cucumbers, tomatoes, and thin Tonkatsu (pork cutlet).
      Wanpaku Sandwich 27
    3. Drizzle Tonkatsu sauce, topped with shredded cabbage and then the top slice.
      Wanpaku Sandwich 28
    4. Now with parchment paper, you will bring the left and right edges of the paper together over the center of the sandwich and line them up. Fold the joined edges down by half an inch and crease sharply. Continue folding in half-inch turns, creasing each time.

      Wanpaku Sandwich 29
    5. As you fold the paper, gently press down the sandwich to make sure it stays in the right location. When the fold is flush with the surface of the sandwich, let it lay flat. Use paper clips to hold in place.
    6. Now we work on one side at a time. Press down the top paper, then form a pleated triangle (on working surface), creasing the triangle’s edges. Then curl up the triangle to tuck into the folds on the side. Repeat for the other side. Set aside for 5-10 minutes.
      Wanpaku Sandwich 31
    7. Using a clean and sharp knife (I use a bread knife), cut the sandwich in half along the “cut” line.
      Wanpaku Sandwich 32
    To Assemble Sandwich: Option 3 - Plastic Wrap & Parchment Paper Method
    1. Prepare a large sheet of plastic wrap; it should be wide enough to fit 4 toasts. Follow exactly as the first two sandwiches above, but with tuna salad. Smear the mayo & mustard spread, followed by lettuce, sliced tomatoes, and cucumbers.
      Wanpaku Sandwich 33
    2. Next, tuna salad, sliced avocados, and boiled egg.
      Wanpaku Sandwich 34
    3. Then top with shredded cabbage, grated carrot salad, and lettuce.
      Wanpaku Sandwich 35
    4. Place the top slice and gently press down as you wrap around the sandwich with plastic wrap, following Option 1 Method. Then use Option 2 Method to cover up the plastic wrap. It’s easier to wrap the sandwich as it doesn’t move.
      Wanpaku Sandwich 36
    5. Here we go over the side. Press down the top paper, fold both sides to form a triangle on the working surface. Then tuck in to the folds on the side.
      Wanpaku Sandwich 37
    6. Work on the other side. Press down the top paper, fold both sides to create a triangle, and then tuck in the triangle into the folds on the side of the sandwich.
      Wanpaku Sandwich 38
    7. Using a clean and sharp knife (I use a bread knife), cut the sandwich in half along the “cut” line.
      Wanpaku Sandwich 39
    To Pack the Sandwich
    1. Use a square lunch box container or take out container to pack your sandwich. Make sure the sandwich stays tight so they will not loosen or fall apart.
      Wanpaku Sandwich 40
    Recipe Notes

    Crispy Tonkatsu: Recipe can be found here.


    Recipe by Namiko Chen of Just One Cookbook. All images and content on this site are copyright protected. Please do not use my images without my permission. If you’d like to share this recipe on your site, please re-write the recipe and link to this post as the original source. Thank you.

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