1. Prepare ingredients: beef, salt, black pepper, white onion, olive oil, bacon, egg yolk, bread embryo, lettuce, tomato slices, cheese slices. 2. Chop the beef into small pieces and add salt and black pepper to taste. 3. Dice the white onion, fry it with olive oil, add the beef filling, add the egg yolk and mix well. 4. Form the beef filling into a round cake and fry until cooked. 5. Place lettuce, tomato slices, meat patties, bacon, and cheese slices on the bread base in sequence.

1. Prepare ingredients: beef, salt, black pepper, white onion, olive oil, bacon, egg yolk, bread embryo, lettuce, tomato slices, cheese slices.

2. Chop the beef and add salt and black pepper to taste.

3. Dice the white onion, fry it with olive oil, add the beef filling, add the egg yolk and mix well.

4. Make the beef filling into a round cake and fry it until cooked.

5. Place lettuce, tomato slices, patties, bacon, and cheese slices on the bread embryo in sequence.

6. Spread a layer of tomato sauce and cover with another piece of bread.