Sweet, savory, and incredibly addictive! This “Infinite” series recipe uses the golden ratio of soy sauce, sugar, and butter. The best part? It’s made entirely in the microwave.

Infinite Japanese Sweet Potato (Mugen Satsumaimo)

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Ingredients

Ingredients
1 Medium Japanese Sweet Potato Satsumaimo
2 tbsp Soy Sauce
2 tsp Sugar You can use cane sugar or lakanto for a healthier option
10 g approx. 1 tbsp Butter

Instructions

Instructions
Prep the Potatoes
Cut the sweet potato into bite-sized pieces (cubes or wedges).
Soak them in a bowl of water for about 5 minutes to remove excess starch.
Drain the water thoroughly.
Seasoning
Place the sweet potatoes in a microwave-safe container.
Add the soy sauce, sugar, and butter.
Microwave Cooking
Cover the container loosely with plastic wrap.
Microwave at 1000W for 5 minutes.
Remove carefully (it will be hot!), and toss everything together so the melted butter and seasonings coat every piece.
Cover again and microwave for another 3 to 5 minutes.
Done! Once the potatoes are fork-tender and have soaked up that savory glaze, they are ready to serve.
Pro-Tips for Success
Meal Prep Friendly: These keep well in the refrigerator for 3–4 days, making them a perfect side dish for bento boxes.
Adjusting Time: Microwave strength varies. During the second round of heating, check the tenderness with a toothpick. If they are still firm, add time in 30-second increments.
The Variety Matters: If you use a “Beni-Haruka” or “Anno-Imo” variety, it will turn out extra creamy and sweet!

Tried this recipe?Let us know how it was!

Pro-Tips for Success

• Meal Prep Friendly: These keep well in the refrigerator for 3–4 days, making them a perfect side dish for bento boxes.

• Adjusting Time: Microwave strength varies. During the second round of heating, check the tenderness with a toothpick. If they are still firm, add time in 30-second increments.

• The Variety Matters: If you use a “Beni-Haruka” or “Anno-Imo” variety, it will turn out extra creamy and sweet!