Place lamb chops in a large pot with cold water, add Sichuan peppercorns and ginger. Bring to a boil and simmer for exactly 10 minutes. Drain and rinse with warm water (cold water will shock the meat and make it tough). Pat every piece completely dry with paper towels—this is non-negotiable for a crispy crust.
Toss dried lamb chops with barbecue seasoning until evenly coated. Let rest at room temperature for 1 hour. If you have more time, marinate in the fridge overnight for deeper flavor
Slice purple onions into 1cm rounds and spread evenly in the air fryer basket. This elevates the lamb chops, allowing hot air to circulate all around, and prevents the bottom from getting soggy.
Arrange lamb chops in a single layer on top of the onions. Air fry at 180°C for 10 minutes
Pull out the basket, flip each chop, and sprinkle extra cumin or chili flakes if you like. Cook for another 8 minutes. For thicker chops, add 2 minutes per side
Transfer to a plate and let rest for 2-3 minutes. This allows the juices to redistribute, so every bite is juicy, not dry. Garnish with sesame seeds and green onions