Fried Onions Dry or French fried onions are a popular snack food, garnish, or vegetable accompaniment to various recipes. In addition, common fried onions are cooked by basic pan frying or sautéing of sliced onions. Furthermore, if using much higher temperature, immersive, deep frying, this prepares the onions in a manner similar to that of French fried potatoes. Smaller and irregularly onions are an integral part of the American dish Green bean casserole. Fresh crisp fried onions will look great as garnishes in many occasions.