This soft steamed cake, known as Mushi-kasutera, is not too sweet, and can be eaten like bread. The secret is a little miso, which adds a subtle saltiness to the cake.
Sift the flour and the sugar together into a large mixing bowl. In a separate bowl, beat the condensed milk, eggs and shiro miso together to make a smooth cream. Add to the flour and mix well. Cover the bowl with clear film (plastic wrap) and leave to rest for 1 hour.