Everyone knows that leftover rice can be made into delicious and nutritious fried rice, but what to do with leftover pancakes? The leftover pancakes are a bit hard and can be made into soup. Cut the cake into thin slices and add In the soup, the cake absorbs the juice of the soup and becomes soft and not rotten. Various seasonal vegetables can be added to the soup. It is simple and nutritious, and it is also a gorgeous transformation of leftovers.