Ultimate Extra-Crunchy Onion Rings | America's Test Kitchen

Ingredients

• 1/2 cup mayonnaise
• 2 tablespoons prepared horseradish
• 2 tablespoons Dijon mustard
• 1/4 teaspoon cayenne pepper
• 1/4 teaspoon pepper
• 4 cups buttermilk
• 4 cups all-purpose flour
• 1/2 cup cornstarch
• 2 tablespoons Lawry's Seasoned Salt
• 2 tablespoons baking powder
• 2 teaspoons pepper
• 1/2 teaspoon table salt
• 2 large onions (1 pound each), peeled
• 3 quarts peanut or vegetable oil for frying