Gelatin Powder (Fish Base): 1lbAcidic powder to adjust the pH of a solution. Citric acid can also be used in virtually any dish to add acid without adding liquid (from vinegar or lemon juice) or any particularly strong flavors, aside from, well, acidity. Use citric acid in soups, like borscht and tomato soup, to balance the flavors. It can also be used in cabbage rolls, and mixed in with salt for rimming extra puckery margaritas. You can even add a half teaspoon of citric acid in