Steps
- Gently shape 800g of ground beef with 20% fat into patties about 4in / 10cm wide. Make a shallow dent in each center; season both sides with salt and pepper.
- Heat half of 2 tablespoons of oil in a heavy skillet over high heat. Cook 3 sliced onions until softened and golden, season with salt and pepper, and remove.
- Heat the remaining oil until hot. Sear the patties for 2 minutes without pressing, flip, and cook for 1 minute.
- Cover and cook for 1 minute, then continue until a thermometer reads 160°F / 71°C in the centers, lowering the heat if needed.
- Split and toast 4 soft hamburger buns. Spread with ½ cup of tomato relish, then add 4 lettuce leaves and 1 large sliced tomato.
- Add the patties, onions, and ¼ cup of sliced dill pickles. Close with the bun tops.