This is just another cute way of making sausage bread. This is easy to make and it's impossible to fail. (There is a picture to the left side)
Every time I've made these, they turn out plump and light, so don't worry. It's really hard to mess this up.
The sausage is on the bottom of the dough, so when you cut with a kitchen knife, the sausage will stop the blade.
Enjoy Japanese food around the world.