Season the ground beef generously with salt, paprika, and pepper. Knead everything together and form into 8 even patties, each slightly larger than the burger buns.
Heat the oil in a pan and fry the patties until almost cooked through. Add the cheddar cheese and let it melt.
Meanwhile, lightly toast the halved brioche buns in the oven, spread with mustard and ketchup, place onion cubes and cucumber slices on top and top with the patties.
Put the lid on and finish in the oven for 1-2 minutes.
Alternative:Place in the prepared brick on the grill and heat for about 5-10 minutes.