Buttermilk Onion Rings | Donna Hay

Ingredients

• vegetable oil, for deep-frying
• 2¾ cups (680ml) buttermilk
• 1 teaspoon baking powder
• 1 teaspoon cayenne pepper
• 2 teaspoons celery seeds
• 2 teaspoons sea salt flakes
• 1 teaspoon cracked black pepper
• 2 cups (300g) plain (all-purpose) flour
• 4 onions, thinly sliced into rounds