The Crispiest Onion Rings | Thinly layered, slightly spicy yellow onions are used to make the light, crisp rings at Balthazar in New York City, where this recipe is adapted from. Beer flavors the batter and adds body, thanks to the bubbles. Baking powder, a leavening agent, helps to enlarge these bubbles as the batter fries. #food #recipe #appetizers #marthastewart #superbowlrecipes