Ishii

Yokan are traditional Japanese sweets, made from sweetened bean or vegetable paste. To make the unique butter-grilled sweet potato yokan (butter-yaki imo-yokan; ¥200 each) at Ishii, Japanese sweet potato is mashed with a little salt, then shaped into blocks and fried on a teppan grill in sizzling butter. They’re served hot, fresh off the grill, which is the best way to enjoy them. Let the alluring smell of caramelised butter guide you to the shop.