Ingredients

Crispy onion rings

• 2 small onions, thinly sliced
• 50 g flour
• 1 tsp garlic powder

Sauce

• 15 g grated Parmesan cheese
• 3 tbsp mayonnaise
• 1 tbsp mustard
• 2 tbsp natural yoghurt

Sandwich

• 400 g steak
• 60 g rocket (arugula)
• Focaccia, halved
• Oil, salt, and pepper to taste
   

Instructions

1. Separate the onion slices into rings and discard the small inner cores. Toss with a little oil to lightly coat.
2. Mix the flour and garlic powder. Toss the onion rings in the mixture until thinly coated.
3. Air-fry at 120 °C for 20 minutes, shaking halfway, until light golden and crisp. (They will crisp further as they cool.)
4. Meanwhile, combine all sauce ingredients in a bowl.
5. Rub the steak with oil and season with salt and pepper. Air-fry at 205 °C for about 8 minutes for medium-rare (cook longer if you prefer it more done). Let rest for 2 minutes, then slice.
6. Assemble the sandwich: spread the sauce generously on the focaccia, add the sliced steak, rocket (arugula), and crispy onions. Serve immediately.