To avoid tearing, caused by sulfur compounds in onions, try holding onions under water to peel, then freeze them for 20 minutes before chopping. An inexpensive pair of plastic goggles from the hardware store is the best way to prevent tears. Onions can be sautéed, baked, roasted, or used in soups, stews, casseroles, and a variety of other dishes. Sweet onions, red onions, and green onions can be eaten raw, on sandwiches, or in salads.