Steam the bread in the steamer for 10 minutes over high heat. (This is for 6 muffin cups of bread, if you're making larger breads using fewer cups, please steam them for a bit longer.)
If you're using joshinko flour the batter will be a bit stiff so please add a bit more liquid. It should be about the same consistency as pancake batter (so use around 130 ml milk).
Story Behind this Recipe
Steamed bread made with rice flour instead of wheat flour makes bread that doesn't go hard as quickly, so I recommend this method. After a few experiments I tried adding more sugar to this recipe to improve the flavour.
When steaming the bread, please make sure the steamer is steaming before adding the bread. Steaming the bread over high heat will give them a nice texture. You can make 4 muffin cups instead if you'd prefer. in that case, steam them for 15 minutes.