I bake sponge cake a couple of time by learning it from youtube. The taste is there but I don't seems to taste the moisture of the cake. Anyone can help?
Why my sponge cake is not moist?
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Sponge cake is not usually intended to be as moist as, for example, a pound cake. A sponge cake is typically used as a foundation for fillings and frosting and usually has a liquid flavoring agent sprinkled over it before being frosted. As the OP stated the addition of butter will add some moisture but it depends on how much.
Separating the eggs first, whipping the yolks with sugar while using the whites to make a meringue will cut down on the eggy taste a fair amount.
It sounds like you're either overbaking, have a separated emulsion, bad recipe or a combination, or oven could be too hot. Why not try to add an extra egg and an extra 2 tbls oil. Too many eggs can be drying, but create the lightness, hence the oil adds moisture. Too much sugar in a recipe can make the cake dense, but sugar also lends to moistness.