Japanese sweet potato pie/puff pastry is on a white plate.

Sweet Potato Pie

Course: Dessert
Cuisine: Japanese
Keyword: pie and tart, sweet potato
Prep Time: 10 minutes
Cook Time: 50 minutes
Total Time: 1 hour
Servings: 2 pies (4" x 7")
Author: Nami

Crispy and flaky, with a smooth, silky filling, Japanese Sweet Potato Pie is my all-time favorite Japanese pastry.  Best enjoyed with a cup of coffee or black tea, this sweet potato pie is light, but rich, making it the perfect afternoon indulgence.

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Ingredients

  • 1 lb Japanese sweet potato (Satsumaimo) (cut in half lengthwise, and cut into 1/2 inch thick slices.) (I used purple sweet potato)
  • 2 frozen sheets puff pastry (Each box comes with 2 square sheets)
  • 2 Tbsp heavy (whipping) cream
  • 4 Tbsp sugar (50 g)
  • 1 Tbsp unsalted butter
  • 1 large egg yolk (for filling)
  • 1 tsp black sesame seeds (roasted/toasted)
  • 1 large egg (for pie)

Instructions

  1. Gather all the ingredients. Preheat oven to 400 ºF (200 ºC). Place 1 sheet of pastry on a baking sheet which has been lined with parchment paper. Put another pastry sheet on a different sheet of parchment paper. Defrost for 10 minutes at room temperature.

    Sweet Potato Pie Ingredients
  2. Cut the pastry sheets in half with a scissor. Now you have 4 rectangular sheets. Then make several slits on 2 sheets that will go on top of the pie.
    Sweet Potato Pie 1
  3. Peel the sweet potato and cut in half lengthwise.  Then cut into smaller chunks so they will cook faster.

    Sweet Potato Pie 2
  4. In a pot, put sweet potato and cover it with water. Bring it to a boil and cook until skewer goes through the potatoes smoothly, about 12-15 minutes. Drain water completely and transfer to a large bow.
    Sweet Potato Pie 3
  5. Use a potato masher or fork to mash the sweet potato. Add sugar and butter and keep mixing.

    Sweet Potato Pie 4
  6. Add egg yolk and heavy whipping cream and mix well.

    Sweet Potato Pie 5
  7. Now you put the sweet potato mixture on the bottom sheets. Keep about half inch space around the rim. Then cover with the top sheet.
    Sweet Potato Pie 6
  8. Use a fork to pinch the edges.
    Sweet Potato Pie 7
  9. Beat the egg in a small bowl and brush top of the pastry so it will turn nice golden-brown. Sprinkle black sesame seeds on top.
    Sweet Potato Pie 8
  10. Bake for 20-25 minutes, or until golden brown. Let cool a bit and ready to serve in 10 minutes.

    Sweet Potato Pie 9

To Store

  1. You can freeze the baked and cooled pies. Wrap in aluminum foil and put in a freezer bag. To serve, reheat the pie at 350 ºF (180 ºC) for 10-15 minutes, until crisp and flaky.