1 Soak roll in lukewarm water. Peel and finely chop shallot and garlic. Sauté shallot and garlic in hot oil until translucent. Remove from heat and let cool. In a bowl, mix together shallot and garlic, ground meat, egg, roll (squeezed to remove water) and mustard. Season with salt and pepper and mix well. Form mixture into 4 patties with wet hands. In a pan, fry patties in butter until browned on both sides. Reduce the heat and continue cooking patties until done.
2 Meanwhile, rinse and spin lettuce dry. Rinse tomatoes, cut out stems and slice. Drain cucumber pickles and cut lengthwise into thin slices. Peel onion, cut into thin rings and sauté in a pan with butter. Cut the rolls horizontally, and briefly warm in oven (200°C or approximately 400°F). (Alternatively, toast rolls in a toaster.) Fry bacon in a pan until crispy and drain on paper towels. Spread bottom half of bun with mayonnaise, and layer with a lettuce leaf, a few pickle slices, a tomato slice and a few onion rings. Place a burger on top. Repeat with additional mayonnaise, lettuce, pickle slices, tomato slices and onion rings. Place a the second patty on top and top with a slice of cheese, onion rings, 2 slices of bacon and ketchup. Top with bun. Repear with remaining sandwich and serve.