White Vinegar (Best Option)
1 teaspoon per 1 tablespoon lemon juiceWhite vinegar is a clear, mild acid that effectively reacts with baking soda to produce carbon dioxide, which helps cookies rise and maintain a tender crumb. Its neutral flavor profile makes it an excellent acid substitute in sugar cookies.
When substituting, use slightly less vinegar than lemon juice to prevent an overpowering vinegar taste. Mix thoroughly to ensure even acid distribution for consistent leavening.
The final cookies will have a similar texture and rise to those made with lemon juice, with only a subtle difference in flavor that is generally unnoticeable in sweet baked goods.