Brownie (Chocolate Brownie), also called chocolate brownie cake, walnut brownie cake or Boston brownie - lovely chocolate cake. It is said that a fat black old woman wearing an apron was baking soft and delicious chocolate cake in the kitchen, but she forgot to beat the cream first, and made a failed work. This cake, which was about to be thrown away, turned out to be unexpectedly delicious when grandma tasted it. This "cute mistake", the brownie cake, has become the most representative cake in American families.