For the seasoning, dry roast pepperberry and salt in a pan and grind in a spice blender or mortar and pestle. Set aside.
For the sauce, mix all ingredients well to combine. Set aside.
For the patties, place mince, egg, macadamias and onion in a large bowl. Season with spicy tomato sauce, pepper leaf, pepperberry, native basil and a good pinch of salt. Mix by hand, squishing together until well combined. Divide evenly into 4 portions. Carefully flatten each portion into a 9cm diameter patty. Transfer the patties to a large baking tray, lined with paper. Refrigerate for 20 minutes to allow the flavours to develop and the patties to ‘set’.
Press a thumb into the centre of each patty to create a small indent to ensure the patties will cook through evenly and remain flat. Drizzle a large non-stick frying pan with the macadamia oil and heat over a medium-high heat. Add the patties and season with the native salt and pepper mix. Cook, for 2 to 3 minutes on each side, until charred and cooked through. Transfer to a plate, season again with the native salt and pepper mix and cover with foil to keep warm. Repeat with the remaining patties.
To serve, heat the burger buns in a warm clean pan with the insides facing onto the base of the pan. Place the bun bases on plates and spread with one generous tablespoon of the sauce. Top with the patty, cheese, pickles, tomato and lettuce. Finish with a layer of sauce, then the burger top. Serve.