McCormick’s Cream of Tartar is all natural and made from the potassium salt of tartaric acid, which is essential when preparing delicate baked goods. This tasteless baking necessity is used to stabilize egg whites. Beat McCormick’s Cream of Tartar with egg whites to stabilize the whites in meringue shells, angel food cakes, meringues for pies, or 7-minute frostings. You can even use it to make your own baking powder.