Bolu kukus

Bolu kukus is an Indonesian traditional snack, a small steamed sponge cupcake whose name means steamed tart. Cooks usually use the term for a kind of kue mangkuk made with wheat flour alone, with no rice flour or tapioca, mixed with sugar, eggs, milk and soda. Vanilla, chocolate, pandan or strawberry flavouring comes from food essence, and beaten eggs together with soda, often lemon sparkling water such as Sprite, act as the emulsifier that keeps the crumb soft and fluffy. It is regarded as a type of kue bolu, the family of sponge cakes, cupcakes and tarts whose name comes from the Portuguese word bolo for cake. Unlike an ordinary baked cupcake it is steamed, and the base is usually wrapped in a corrugated paper cup.