Finely dice the rolls and soak in 300 ml of warm water for 20 minutes. Fry the bacon in a pan until crispy. Drain on kitchen paper. Heat the baked beans. Cut the onions into slices and sauté in 1 tablespoon butter until soft. Finely crush the coffee beans with a pinch of salt in a mortar. Cut the pickled cucumber into slices. Cut lettuce leaves.
Squeeze out the rolls well and knead them together with the egg and mince in a bowl. Season with salt and pepper and form 4 patties with moistened hands.
Heat the oil in a pan and fry the patties for 3 - 4 minutes on each side. Season with the coffee salt.
In the meantime, cover bread slices with the cheese and roast them in a preheated oven at 180 degrees for 6 - 8 minutes.
Place 1 patty each on a plate and top with onions, lettuce, bread slices, baked beans, pickled cucumber and bacon. Brush with mustard and barbecue sauce and finish with the remaining patties.