McCormick Gourmet Non-GMO Kosher All Natural Cream Of Tartar, 2.62 oz Bottle. McCormick Gourmet Cream of Tartar is an essential ingredient for bakers. It is used to stabilize beaten egg whites when preparing angel food cake, meringues, macarons, and 7-minute frostings, resulting in light and fluffy desserts. Cream of tartar, also known as tartaric acid, is a byproduct of winemaking. A pinch of cream of tartar has a similar stabilizing effect on homemade whipped cream. Cream of tartar also prevents...