Indulge in the delightful fusion of traditional Japanese flavors and classic French dessert with this Japanese sweet potato creme brulee. The creamy texture of the sweet potatoes combined with the rich custard base creates a unique and unforgettable treat. Perfect for impressing guests or enjoying a special night in.
Japanese sweet potatoes, also known as Satsumaimo, are not always found in every supermarket. They have a distinctively sweet flavor and a purple skin with a yellow interior. If you can't find them, you can substitute with regular sweet potatoes, though the flavor profile will be slightly different. Make sure to check the produce section or specialty Asian markets for the best results.

Ingredients For Japanese Sweet Potato Creme Brulee
Japanese sweet potatoes: These sweet potatoes have a unique flavor and texture that set them apart from regular sweet potatoes. They are sweeter and have a denser flesh.
Heavy cream: This adds richness and a creamy texture to the custard base.
Milk: Used to lighten the heavy cream and create a smooth consistency.
Sugar: Essential for sweetening the custard and creating the caramelized top.
Egg yolks: These provide the custard with its rich and creamy texture.
Vanilla extract: Adds a depth of flavor and enhances the sweetness of the dessert.
Technique Tip for This Recipe
When incorporating the mashed sweet potatoes into the custard mixture, ensure they are thoroughly mashed and free of lumps. This will help achieve a smoother texture in the final creme brulee. Additionally, when heating the heavy cream and milk, be careful not to let it boil, as this can cause the mixture to curdle. Instead, heat it until it is just about to boil, then remove it from the heat immediately.
Suggested Side Dishes
Alternative Ingredients
japanese sweet potatoes - Substitute with regular sweet potatoes: Regular sweet potatoes have a similar texture and sweetness, making them a suitable alternative.
heavy cream - Substitute with coconut cream: Coconut cream provides a rich and creamy texture while adding a subtle coconut flavor.
milk - Substitute with almond milk: Almond milk is a lighter, dairy-free option that can still provide the necessary liquid content.
sugar - Substitute with honey: Honey adds a natural sweetness and a slightly different flavor profile.
egg yolks - Substitute with silken tofu: Silken tofu can mimic the creamy texture of egg yolks and is a good vegan alternative.
vanilla extract - Substitute with almond extract: Almond extract offers a different but complementary flavor to the dish.
sugar (for caramelizing) - Substitute with maple syrup: Maple syrup can be used to create a caramelized topping with a unique flavor twist.
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How to Store or Freeze This Dessert
Allow the Japanese sweet potato creme brulee to cool completely at room temperature before storing. This ensures that condensation does not form inside the storage container, which could affect the texture.
Once cooled, cover each ramekin tightly with plastic wrap or aluminum foil. This helps to prevent the absorption of any unwanted odors from the refrigerator.
Place the covered ramekins in the refrigerator. The creme brulee can be stored in the refrigerator for up to 3 days. For optimal freshness, consume within this time frame.
If you plan to store the creme brulee for a longer period, consider freezing it. To freeze, first ensure the creme brulee is completely cooled and covered tightly with plastic wrap or foil.
For added protection, place the wrapped ramekins in a freezer-safe zip-top bag or airtight container. This double layer of protection helps to prevent freezer burn and maintain the dessert's creamy texture.
Label the container with the date of freezing. The Japanese sweet potato creme brulee can be frozen for up to 1 month. Beyond this, the texture may begin to degrade.
When ready to serve, thaw the creme brulee in the refrigerator overnight. Avoid thawing at room temperature to prevent any risk of bacterial growth.
Once thawed, remove the plastic wrap or foil and sprinkle a thin layer of sugar on top of each creme brulee.
Use a blowtorch to caramelize the sugar until golden and crispy. Serve immediately to enjoy the perfect contrast between the creamy custard and the crunchy caramelized top.
How to Reheat Leftovers
Preheat your oven to 300°F (150°C). Place the creme brulee ramekins on a baking sheet and cover them loosely with aluminum foil. Heat for about 15-20 minutes or until warmed through. This method ensures even heating without compromising the delicate texture.
Use a microwave for a quicker option. Place the creme brulee in the microwave and heat on medium power in 15-second intervals. Check frequently to avoid overheating, which can cause the custard to curdle.
For a stovetop method, fill a saucepan with water and bring it to a gentle simmer. Place the ramekins in a heatproof dish and set it over the simmering water, ensuring the water doesn't touch the ramekins. Cover the dish with a lid or foil and steam for about 10-15 minutes, checking occasionally.
If you have a sous-vide machine, set it to 140°F (60°C). Place the creme brulee ramekins in a vacuum-sealed bag or a ziplock bag with the air removed. Submerge in the water bath for about 30 minutes. This method maintains the custard's creamy consistency perfectly.
Avoid reheating the caramelized sugar topping. If you want to enjoy the crispy top again, re-caramelize it by sprinkling a fresh layer of sugar and using a blowtorch just before serving.
Best Tools for This Recipe
Oven: Used to preheat and bake the creme brulee to ensure it sets properly.
Mixing bowl: Essential for whisking together the egg yolks and sugar until pale and creamy.
Whisk: Helps in blending the egg yolks and sugar, and later for incorporating the hot cream and milk mixture.
Saucepan: Used to heat the heavy cream and milk until just about to boil.
Ramekins: Small dishes in which the creme brulee mixture is poured and baked.
Baking dish: Holds the ramekins and hot water for the water bath during baking.
Measuring cups: Ensures accurate measurement of ingredients like heavy cream, milk, and sugar.
Measuring spoons: Used for measuring smaller quantities like vanilla extract.
Blowtorch: Caramelizes the sugar on top of the creme brulee to create a crispy, golden crust.
Masher: Used to mash the Japanese sweet potatoes until smooth.
Spatula: Helps in blending the mashed sweet potatoes into the mixture.
Kettle: Useful for boiling water to fill the baking dish for the water bath.
How to Save Time on Making This Recipe
Prepare ingredients in advance: Measure and mash the japanese sweet potatoes ahead of time.
Use a blender: Blend the sweet potato mixture for a smoother texture.
Heat cream and milk together: Combine heavy cream and milk in one step to save time.
Use a water kettle: Boil water in a kettle for the water bath to speed up the process.
Chill quickly: Place the ramekins in the freezer for a short time before refrigerating to cool faster.

Japanese Sweet Potato Creme Brulee
Ingredients
Main Ingredients
- 2 cups Japanese sweet potatoes, mashed
- 1 cup Heavy cream
- ½ cup Milk
- ½ cup Sugar
- 4 Egg yolks
- 1 teaspoon Vanilla extract
- 2 tablespoon Sugar (for caramelizing)
Instructions
- Preheat your oven to 325°F (160°C).
- In a mixing bowl, whisk together the egg yolks and sugar until pale and creamy.
- Heat the heavy cream and milk in a saucepan until just about to boil. Remove from heat and slowly pour into the egg mixture, whisking constantly.
- Add the mashed sweet potatoes and vanilla extract to the mixture, blending until smooth.
- Pour the mixture into ramekins and place them in a baking dish. Fill the dish with hot water halfway up the sides of the ramekins.
- Bake for 35-40 minutes, or until the centers are just set. Remove from the oven and let cool to room temperature, then refrigerate for at least 2 hours.
- Before serving, sprinkle a thin layer of sugar on top of each creme brulee and caramelize with a blowtorch until golden and crispy.
Nutritional Value
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Suggested Appetizers and Main Courses
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