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Export 6 ingredients for grocery delivery
Step 1
Place the mushroom on a foil-lined baking sheet, spray twice with oil, and season with salt and pepper. Slide under a medium-hot broiler for 5-6 minutes until cooked and still juicy. Keep warm.
Step 2
Meanwhile, in a small bowl, combine the ground beef with the steak rub, and gently form into a loose burger. Spray a small frying pan with 3 squirts of oil, and cook the burger over medium heat for 2–3 minutes each side for medium-rare, or until done to your liking.
Step 3
Serve the burger on top of the mushroom, topped with the onion rings and arugula.