Red Bean Bun recipe? (Japanese cuisine question)?

I love red bean buns. I used to get them at an Asian grocery in my hometown, but I have since moved out to attend graduate school. I haven't been able to find the buns in my area, but I love to cook and want to know how to make them. Does anyone know what the light, sweet-tasting dough used for steamed bean buns is called? I'm not sure what recipe to look for!!