Chop the pickle very finely, wash the lettuce and tomato thoroughly, and slice the tomato and onion to put in the burger.
Cook the 2 patties in a pan for 2 minutes on each side, remove the patties from the pan and use a paper towel to clean the pan. Then, place the buns on both sides to brown and prepare the sauce by putting the mayonnaise, pickled cucumber, ketchup, and a little juice (1 tbsp) from the pickle jar in a bowl. Take the buns and "assemble" the burger.