LEMON SPONGE

The egg yolks act as emulsifiers, binding the acidic lemon juice with the gelatin matrix to create a smooth, stable foam. Gelatin forms a network of proteins that trap air bubbles from the beaten eggs, creating the characteristic sponge texture. The sugar not only sweetens but also stabilizes the foam by increasing viscosity and helps prevent the gelatin from becoming rubbery. The acid from the lemon juice slightly weakens the gelatin structure, resulting in a more delicate, tender set rather than a firm jelly.