Stone-Roasted Murasaki Sweet Potato Butter Spread

Stone-Roasted Murasaki Sweet Potato Butter Spread

A Simple, Indulgent Way to Enjoy Japanese Purple Sweet Potatoes

It's the most indulgent way to enjoy sweet potatoes that discovered by produce experts.

Maruju Seika is a company built around fresh produce, with years of experience selecting fruits and vegetables at their best. Through that work, they’ve learned how much flavor depends on timing, condition, balance and color, sweetness, and aroma all matter.

Among many options, they arrived at purple sweet potatoes with a natural harmony of taste and appearance. To enjoy them in the most satisfying way, the answer turned out to be simple: stone-roast them slowly, then finish with a touch of butter. It’s a quiet but indulgent way to let the ingredient shine.

Choosing Sweet Potatoes That Shine When Roasted

Purple sweet potatoes change a lot depending on variety and harvest. Some grow sweeter, others stay firm, and some lose their color when heated.

Produce specialists at Maruju Seika look for potatoes that deepen in sweetness, develop a richer aroma, and keep their beautiful tone once roasted. By paying attention to how the potatoes transform with heat, they select ones that show their character best through stone roasting.

About Stone Roasting

Stone roasting is a traditional method that uses the gentle, even heat of hot stones. Rather than scorching the surface, the heat surrounds the potato and cooks it slowly, keeping moisture inside.

✔ Gently draws out natural sweetness.

✔ Keeps the inside moist and fluffy.

✔ Creates a lightly fragrant, roasted finish.

✔ Enhances the true flavor and texture of purple sweet potatoes.

✔ Needs no added sugar or seasoning.

Finished with Butter

At the end, butter is added to softly support the sweetness of the potato. As it melts, it adds depth without masking the natural taste. The finish is rich, yet surprisingly light.

Not overly sweet. Not too heavy. Just good ingredients, treated with care.

This is a stone-roasted purple sweet potato with butter that experts say the most indulgent way discovered by people who truly understand produce.

- JX Way - 

With good ingredients, honest preparation,
and the ease to enjoy it anytime —
this small pack brings a touch of Japanese seafood dining
into your everyday meals :)

- Fukushima Joban Fish Market - 

This product is featured as part of a special event showcasing Joban-mono—the fresh seafood and marine specialties from the Fukushima coast.

Renowned for their firm texture and clean, rich flavor, Joban-mono fish are highly regarded in Japan, with 99% of former Tsukiji Market professionals acknowledging their superior quality.

The event includes family-friendly activities, tasting booths, and learning corners that introduce visitors to Fukushima’s marine culture, environmental efforts, and SDG initiatives—all while enjoying the region’s seafood.

It also serves an important role in supporting Fukushima’s ongoing recovery from the Great East Japan Earthquake, helping local producers reach new markets and overcome long-standing reputational challenges.

Other Fukushima Collection

More Details