Three-Cheese Florentine Burgers

• 1-1/3 cups fresh baby spinach
• 1 tablespoon plus 1-1/2 teaspoons balsamic vinaigrette
• 1 large egg
• 1/3 cup fresh baby spinach, finely chopped
• 3 tablespoons crumbled feta cheese
• 3 tablespoons shredded Asiago cheese
• 3 tablespoons chopped red onion
• 1 tablespoon plus 1-1/2 teaspoons ketchup
• 2 teaspoons Worcestershire sauce
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 1 pound ground beef
• 4 ounces fresh mozzarella cheese, sliced
• 4 whole wheat hamburger buns, split

1. Place spinach in a small bowl. Drizzle with vinaigrette and toss to coat; set aside.
2. In a large bowl, combine the egg, chopped spinach, cheeses, onion, ketchup, Worcestershire sauce, salt and pepper. Crumble beef over mixture and mix well. Shape into four patties.
3. Grill burgers, covered, over medium heat or broil 4 in. from the heat for 5-7 minutes on each side or until a thermometer reads 160u0b0 and juices run clear. Top with mozzarella cheese. Grill 1-2 minutes longer or until cheese is melted. Serve on buns with spinach mixture.

baby spinach, balsamic vinaigrette, egg, baby spinach, feta cheese, cheese, red onion, ketchup, worcestershire sauce, salt, pepper, ground beef, mozzarella cheese, whole wheat hamburger buns

Taken from www.tasteofhome.com/recipes/three-cheese-florentine-burgers/ (may not work)