Buttermilk Onion Rings Recipe - How To Make Onion Rings

Ingredients

• Vegetable oil
• 1 c. all-purpose flour
• 1/3 c. fine cornmeal
• 3/4 c. cornstarch
• 1 tsp. baking powder
• 1 tsp. freshly ground black pepper
• 1/4 tsp. smoked paprika
• 1 egg, lightly beaten
• 3/4 c. buttermilk
• 1/4 c. seltzer
• 2 large Vidalia onions, cut into 1/2"-thick rings
• Kosher salt, for sprinkling
• Ketchup, for serving
• Mayonnaise, for serving