A sweet bread dough : 1 ts of yeast, 3 tbs of kurozato black sugar, 2 cups of AP flour, enough tonyu (home-made soy milk) to wet that. I’ve mixed it in the home-bakery machine.
Filled with sakura an paste and shaped.
The Japanese versions are often made of koshian (pasted beans) way much sweeter. The bread is also richer (fatter and sweeter) and extremely soft. Mines are not like bread. Slightly healthier too. I love this little snack.