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Gently mix 600 g ground beef (20% fat), 2 teaspoons "Holy Orangoly" by Rock'n'Rubs, 1 tablespoon finely grated orange zest, and 1 teaspoon Worcestershire sauce. Form into 4 patties. Chill for at least 30 minutes.
Slice 2 red onions into rings. Briefly bring 100 ml orange juice, 50 ml white wine vinegar, and 1 tablespoon honey to a boil, then pour over the onion rings. Let marinate for at least 1 hour.
Mix together 100 g mayonnaise, 1 clove of garlic, 1 tsp orange zest, 1 tsp orange juice, and a pinch of pepper.
Slice 2 ripe peaches into wedges and grill them on the barbecue or in a grill pan for 2–3 minutes on each side.
Grill the burgers at 220–250 °C for 3–4 minutes per side for medium, then let them rest briefly. Optionally, melt Cheddar or Gouda on top during the last minute.
Spread orange aioli on the bottom bun. Layer arugula, patty, cheese, grilled peaches, and pickled red onions on top. Lightly spread aioli on the top bun.