Craving onion rings? This Thermomix air fryer recipe will satisfy your cravings without the guilt. Slice onions into rings, dip them in a batter made with flour, spices, and buttermilk, and air fry them until golden and crispy. The result is a batch of homemade onion rings that are just as delicious as the ones you'd find at a restaurant. Serve them as a side dish or as a tasty snack.