1/2 medium red onion, thinly sliced
1-1/2 cups shredded lettuce
12 potato dinner rolls, split
1/4 cup Dijon mustard
1/2 cup mayonnaise
6 slices Muenster cheese, halved
1/2 tsp. ground cumin
1-1/2 tsp. Worcestershire sauce
2 tsp. hamburger seasoning
1 large egg
2 green onions, thinly sliced
1/4 cup finely chopped red onion
1 package (20 ounces) lean ground turkey