Onion Rings are a popular deep-fried snack that are often served as a side dish or appetizer. To make Onion Rings, you can begin by preparing the batter and slicing onions into thick rings. The batter is typically made of flour, cornmeal, baking powder, salt, and milk. To make the batter smooth, it's important to whisk it well and let it sit for a few minutes. In the meantime, heat up the oil in a deep fryer or a large pot.