Japanese Sweet Potato Butter Bake

Japanese Sweet Potato Butter Bake

Baked Low and Slow, Just to Let the Sweetness Come Through

*This product is a collaboration with Mitaseru, part of the Mitsui Fudosan Group, a Japanese online platform that delivers dishes from renowned restaurants across Japan to your home.



Made with carefully selected Japanese sweet potatoes, each one is slowly baked for about an hour to bring out its natural sweetness and depth of flavor.

To highlight what’s already there, they keep the process simple. Each potato is cut in half and gently scooped, then blended with just a touch of butter and milk until smooth and creamy. The filling is returned to its skin and finished by hand, one by one.

They don’t add much,  just a little butter and milk to bring everything together.
It stays true to the sweet potato itself. Soft, gently creamy, and naturally sweet, with a kind of warmth that just feels comforting.

What Makes It So Good

・Not overly sweet - You taste the sweet potato first, not just sugar
・A little richness, but still light -The butter adds depth, but it doesn’t weigh you down
・Bigger than expected -Many people end up saving half for later
・Soft and comforting texture - Moist, creamy, and just satisfying

Crafted in Saga, with Care

Chef Naoki Kondo trained for seven years at Cerulean Tower Tokyu Hotel before joining Gyumaru at 25. Since then, he has been part of shaping products that respect tradition while quietly refining them through experience.

Gyumaru, a beloved hamburger steak restaurant from Ureshino, Saga, is known for its thoughtful approach to ingredients and flavor, something locals have trusted for years.

This sweet potato reflects that same philosophy. Simple, carefully made, and easy to enjoy at home, a small, comforting treat that brings a subtle sense of something special to your everyday table.

How to Enjoy

Thaw in the refrigerator for about 6 hours.
Remove from the container and serve on your favorite plate.

For the best experience
After thawing, transfer to a plate and warm in the microwave (500W) for about 1 minute 30 seconds.
It becomes softer, more fragrant, and even more enjoyable.

What Customers Are Saying

“Larger than I expected — I ended up enjoying it in two sittings. The texture is soft and the sweetness is really elegant.”

“It’s light, but you can still taste a bit of buttery richness. I actually preferred it with warm milk instead of coffee.”

“Because it still has the skin, you really get that natural sweet potato flavor. It feels more authentic somehow.”

“If you like sweet potatoes, this is hard to resist. The sweetness is gentle and comforting.”

Letting the Ingredient Speak

Slow-baked to bring out the natural sweetness of the sweet potato, then gently blended with butter and milk for a soft, creamy finish. Not overly sweet, not overly rich — just a sweet potato, brought to its best.

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