Air Fried Filet-O-Fish

1 Pat the 340 g cod dry and cut it into four equal portions. Season lightly with salt and black pepper.
2 Put the egg whites and panko in separate shallow bowls. Coat each portion in egg whites, then press into the panko. Use up to 30 g panko for the four portions.
3 Lightly spray the coated fish with neutral oil. Air-fry in a single layer at 390°F for about 8–12 minutes, working in batches if needed, until the thickest part reaches 145°F (63°C).
4 Mix the light mayonnaise, plain fat-free Greek yogurt, relish and finely chopped fresh dill. Taste, then add salt, pepper and zero-calorie sweetener only if needed.
5 Divide the fish, cheese and tartar sauce among four Culture keto buns. Serve while the fish is crisp.