White Vinegar (Best Option)
1 teaspoon per 1 tablespoon lemon juiceWhite vinegar is a clear, mild acid that reacts with baking soda to produce carbon dioxide, which helps the cake rise and stay fluffy. Its neutral flavor profile ensures it won't compete with the vanilla essence.
For best results, use distilled white vinegar in the exact ratio to avoid any vinegar aftertaste. Mixing it thoroughly into the wet ingredients helps distribute acidity evenly.
Compared to lemon juice, white vinegar provides similar acidity but lacks citrus flavor, resulting in a slightly less bright but still tender and well-leavened cake.