I made soybean milk one day and had a lot of the pulp (okara) left over. My nan used to use to as compost for our garden, but now we use it to make mantou. Since we can use it to make mantou, I thought why not bake a cake with it? hehe.
This is one case where experimentation has gone completely smoothly! The cakes, despite okara being quite dense, were light and fluffy! I played around with my usual chiffon recipe and substituted this and that, and it worked!