Ingredients:

For the cutlet:
500 g ground beef (it is better to choose marbled beef)
1 medium onion, finely chopped
2 garlic cloves, finely chopped
1 egg
2 tablespoons breadcrumbs
1 teaspoon of salt
1/2 teaspoon black pepper
1/4 teaspoon paprika
For buns:
4 burger buns
1 tablespoon melted butter
Sesame seeds for sprinkling
For the sauce:
1/2 cup mayonnaise
1 tablespoon ketchup
1 teaspoon mustard
1/4 teaspoon Worcestershire sauce
1/4 cup finely chopped pickled cucumber
1/4 cup finely chopped red onion
Additional ingredients:
1 ripe tomato, sliced into slices
1 lettuce leaf
1/2 red onion, sliced into rings
1/4 cup pickled cucumbers, cut into slices
100 g Cheddar cheese, sliced