Greek-Style Chicken Burgers

Ingredients

• sauce:
• 1/3 cup fat-free plain Greek yogurt
• 1/4 cup chopped peeled cucumber
• 1/4 cup crumbled reduced-fat feta cheese
• 1-1/2 teaspoons snipped fresh dill
• 1-1/2 teaspoons lemon juice
• 1 small garlic clove, minced
• burgers:
• 1 medium onion, finely chopped
• 1/4 cup dry bread crumbs
• 1 tablespoon dried oregano
• 1 tablespoon lemon juice
• 2 garlic cloves, minced
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1 pound ground chicken
• 4 hamburger buns, split
• 4 lettuce leaves
• 4 tomato slices