For the hamburger, peel onion, dice, sauté in oil until translucent, let cool.
Season the mince with crushed mustard seeds, capers, salt and pepper, knead together with the onions.
Finely dice the cornichons, crush the peppercorns, peel the garlic and press it through a press. Mix everything with the tomato ketchup, season.
Roll out minced meat in portions 1 cm thick, shape with a 10 cm diameter cookie cutter. Grill the hamburger patties on both sides in oil or, if necessary, roast them in a frying pan in hot oil on both sides, carefully turning them to the other side. Allow to cool.
Cut the hamburger buns in half, spread the halves all very thinly with the tomato sauce, place 1 lettuce leaf, 1 tomato slice and onion rings on each. Place the hamburgers with the remaining sauce between the bun halves. Serve.
Preparation Tip:
The hamburgers can also be prepared with any other sauce.
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