Easy Japanese Recipes

Food Safety Tips For Bento

Bento 101 Food Safety Tips | Easy Japanese Recipes at JustOneCookbook.com

Here are some important tips to keep your bento safe:

Before Packing

  • Wash your hands and make sure your bento box is clean.

While Packing

  • Use clean utensils (chopsticks etc) or plastic gloves when you touch food.  Your hands have germs and it’s better to avoid touching with hands.  If you touch one food to the other with the same utensil, wipe off the utensil in between, or simply use another utensil.  If you decide to wash it, then make sure your utensil is completely dry before picking up another food.
  • Highly recommend to re-heat pre-cooked/leftover food before packing.  If you do so, I also recommend to heat up with a pan or toaster oven instead of microwave so that food, especially meat, is heated THOROUGHLY and not partially.
  • Before you pack cold/cool food in your bento box, hot/warm rice must be cooled down.  It’s dangerous when hot/warm rice heat up other food halfway because bad bacteria would start growing.
  • Remove all liquid from the food which could spoil faster.

After Packing

  • To avoid risk of any bad bacteria starting to grow (bacteria love a warm moist environment), you must cool down the food first before closing the bento, especially if the lunch box will stay at room temperature until lunch time.
  • Use ice packs to keep food fresh and safe till lunch time.

Why do we reheat food?

Japanese Bento is meant to eat at room temperature.  Please remember that the longer food has been lying around, it gets less fresh, even you put ice pack or keep it in the refrigerator.

Therefore, I highly recommend to reheat cooked food before packing lunch.  Reheating cooked food kills bacteria.  It’s better to take extra safety precaution especially if you live in humid or hot weather.

All you need to do is to reheat the food, let it cool down completely before closing the bento box (bacteria grows in warm moist environment), and then keep the bento cool with ice pack whole time with till lunch time.

However, if you can keep your bento box cool all the time and can reheat prior to lunch, it is okay to pack lunch previous night instead of reheating and packing in the morning before you leave the house.

Read more about food poisoning and food spoilage here, here, or here.

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  • mariani October 12, 2013, 11:25 pm

    Hello! I’m in Indonesia and I love your website!
    I always prepare lunch boxes for my kids too. But the main problem is the same: I cook in the morning, and put all the warm/hot food ( fresh cooked rice, fried nugget, boiled sausage, etc — everything hot directly to the lunch boxes); then the kids zoom out to school.
    To avoid unwanted effect of plastic boxes, I use good quality stainless lunch boxes. Is it safe to put hot food at 7 a.m., then the kids will eat them at 9.30 or 10 a.m.?
    Older kids even have to stay longer for school and they got “resting time” (can eat and rest) at 10 a.m. and 1 p.m… is it possible to make bento in the morning and be eaten at 1 p.m.?

    • Nami October 13, 2013, 9:52 pm

      Hi Mariani! Thank you so much for following my blog! :)

      First of all, since you live in Indonesia, pretty warm/hot/humid place, I will take the safety extra cautious. In Japan, we have to be VERY careful to make bento because it goes bad fast due to the hot and humid weather.

      Unless you use thermal lunchbox, I don’t recommend you to pack HOT food and close the bento box to eat later. Condensation from hot food will create warm humid place inside the bento box and bactaria thrive in such environment. If your children love hot food, can you buy thermal bento box so that it stays hot and don’t mix with other cold/room temperature foods?

      You make bento at 7am and it’s okay to eat around 1pm too (probably not later than that). If you don’t use thermal lunch box, you need to cool down the foods first before you close the lunch box. You can put ice packs under and on top of bento to cool down faster. Then pack ice packs inside the lunch bag too, to keep it cool. Especially when it’s hot and humid day, it’s very important. :)

      Hope that helps.

  • Faith November 15, 2013, 10:24 pm

    Great tips. I work at a flower shop so I’m able to keep my food in the cooler til lunch time. Lucky me :)

    • Nami November 17, 2013, 2:21 am

      Thank you Faith! :)

  • Grant November 21, 2013, 11:21 am

    What if you wanted to eat 5 meals away from home. Would you reheat all of them, cool them down, and put an overpack with them? I like the idea of eating room temp food safely but I guess I’m confused as to why it’s needed to reheat the food if it’s been frozen the whole time. Wouldn’t that just keep it in the “danger zone” longer?

    • Nami November 21, 2013, 11:33 am

      Hi Grant! If it’s been frozen, and you can keep it frozen until you heat it at your lunch place, then that’s no problem.

      This “reheating” is for
      – packing leftover food
      – keeping lunch box at room temperature/cool place till lunch time (not in fridge)
      – have no access to reheat before meal
      – people live in the area with high temperature and humidity.

      Basically reheating kills bacterias and by re-heating in the morning, you may stop the food from going bad.

      If you live in a cold place, you don’t have to worry as much as someone who lives in hot and humid place. It is important for me to talk about it for everyone, as I include “leftover” food from previous night into lunch box.

  • Abdul Rafeh December 16, 2013, 3:58 am

    hello ^^ i really like your blog but i have a problem
    I’m 15 and i’m thinking of preparing a bento box for myself because my mom usually doesn’t because since we’re from Pakistan and only i’m interested in japanese stuff my family doesn’t even know what a bento is,but the problem is that whenever my mom used to make a lunch box for me when i was young the food would always be stuffed at the side of the box(partly because i placed it vertically in my bag) but i really need a solution for this….thank you
    p.s. i’d also love some easy to cook suggestions for the bento

    • Nami December 16, 2013, 12:27 pm

      Hi Abdul! Thank you so much for your kind comment! The only way to keep the food in place is to pack tightly. Lunch box with compartments or silicon cups help a bit but the key is to pack food tight that it won’t shift. I always put leftover main dish in bento. And fill in the gap with veggies etc. Hope this helps!

      • Abdul Rafeh December 17, 2013, 1:02 am

        ^^ thank you very much i’ll try that

        • Abdul Rafeh December 17, 2013, 1:05 am

          oh i forgot to ask sorry ^^……..in the bento box is there a good replacement for meat,chicken cutlets etc?

          • Nami December 19, 2013, 10:19 pm

            Hi Abdul! You really can put anything you like. There’s no rule for what needs to be in the bento box. Well, no raw food, but that’s about it. :)

  • Edwin Taniguchi December 21, 2013, 1:01 pm

    I am very much impressed by the wide variety of recipes and wealth of useful cooking related information that is contained on your website.

    • Nami December 22, 2013, 1:28 am

      Hi Edwin! Thank you so much for your kind words! :)

  • SN06 July 29, 2014, 5:27 pm

    any tips for how i can pack my bento in my backpack without squishing it owo and also is it ok to keep a boiled egg out for more than 5 or 4 hrs ?

    • Nami August 3, 2014, 11:43 pm

      Hi SN06! I usually pack in bento box, then put it in an insulated lunch bag with ice packs in it. For boiled egg, 4-5 hours should be okay as long as bento box is in an insulated bag with ice packs (but when I was small, we didn’t have an insulated lunch bag and a boiled egg was in the bento too….). :D

  • April August 27, 2014, 8:28 pm

    Do you know a good thermal lunchbox I can get? I have been looking around for one, but I can’t find one that people say actually keeps the food warm.

    • Nami August 27, 2014, 8:46 pm

      Hi April! My kids use Thermos Food Jar. I pour boiling water into the jar twice (hot water become warm immediately after pouring for the first time, so I do it again to make sure inside is hot) before adding lunch inside. My kids say the food is “warm” (not hot) when they eat. They said it’s okay. Hope this helps!

      Here’s the link: http://www.thermos.com/product_catalog.aspx?CatCode=FOOD (You can buy on Amazon).

  • Penny December 25, 2014, 5:00 am

    Hi,im only 12 and i am thinking of preparing bento for myself and i am not really sure about the basics,what items i need etc. so i am hoping that you can tell me about those and where can i buy my supplies in singapore

  • Jada J January 18, 2015, 7:30 pm

    Hi Nami! I’m fifteen years old and for my next birthday, I wanted have a Japanese themed birthday party including bento boxes.
    I have two questions:
    1. Do you know where I can get bento boxes in bulk?
    2. What are the best foods that everyone likes in their bento boxes?

    Thank you, Jada J

    • Nami January 20, 2015, 11:48 pm

      Hi Jada! Happy Early Birthday! :) Here are my answers:

      1) I’m not sure if you can buy in bulk, but ask an online shop like http://en.bentoandco.com/?

      2) What’s your popular Japanese (bento) food in your country, and which dishes are familiar to them? Maybe onigiri (rice ball) and karaage, etc? Popular foods in Japan can be different in another country.. :)

  • sharmine February 7, 2015, 10:54 am

    hihi Nami. I’ll be starting my intern and my allowance from it wouldn’t be enough to cover my lunch so i was thinking of packing food to work… but problem is i’m not a morning person and i was just wondering if it’s possible to pack my bento before bed and then take it out of the fridge after that without reheating in the morning since it’ll probably be at room temperature at lunch? do i have to ensure that the lid is closed only after it’s cooled down? can’t i just close it immediately and dump it into the fridge? sorry, i’m quite new to cooking and these are all like rocket science to me hahaha. thanks for the wonderful recipes. :)

    • Nami February 7, 2015, 3:19 pm

      Hi Sharmine! Do you live in hot and humid area? If not, I won’t worry too much. However, if you do, try to keep your lunch cold from previous night you make bento until you are ready to eat. It goes bad when the food is at room temperature. Also, please put the lid on after cooling down. The condensation from the lid (if you put the lid on when food is still hot) should be avoided. It is great if you can re-heat the lunch (with microwave?) if you can. Hope this helps! Good luck with your internship! :)

  • Dubu February 13, 2015, 1:28 pm

    Hi! Thank you for sharing your advice. I’m going to be a new bento-user (waiting to receive my bento box). I was wondering, what if you don’t have the option to heat your food at work? We don’t have a microwave at work. But we do have a fridge, where I can keep the box cool. In this situation, should I only eat ‘cold’ food, like fruits, veggies and (cold) rice?

    • Nami February 17, 2015, 10:12 pm

      Hi Dubu! Traditionally, we eat bento at room temperature. Kids at school and people at work… we are all accustomed to eat room temperature bento. We only put food that tastes good at room temperature too. So that’s one reason why we even put bento ingredients in non-thermo bento box. These days people might microwave as bento box became “microwavable”. We usually keep the bento at room temperature (unless it’s hot weather), or cool with ice pack or in the refrigerator (if available), and eat at room temperature. If you prefer warm food, you might want to consider thermos jar that can keep the food relatively warm till lunch time (not hot). Hope this helps… If you want to use your new bento box, choose ingredients that you enjoy at room temp or cool. :)

  • Billy Ramey April 16, 2015, 5:03 pm

    I’m a 16 year old high school student. I am not Japanese, though I really love everything about the country and culture. I want to prepare a bento box, but I’m at a loss as to how to do it safely without having to worry about getting sick. I know you covered a lot in this article, but I’m still confused. Can you make it any simpler for me?