Preparation / Directions:
1. Combine the beef, egg yolks, spinach, onion, salt and pepper in a bowl and mix well. 2. Divide the beef mixture into 4 portions. Take 3/4 of each portion and form 4 patties. Form an indentation in the center of each patty and divide the cheese between the four into the indentations. Cover the indentations with the reserved meat and form finished patties. 3. Cook the patties on the grill or under the broiler for 2 minutes per side for rare. Increase the cooking time for more done burgers.
Serve on sesame seed kaiser buns with lettuce, mayonnaise and garden-fresh tomatoes.
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