Greek Feta Burgers

This is from Cooking Light. Posting for ZWT3.

• Ready In: 15 mins
• Serves: 4

Ingredients

• 1 (10 ounce) package frozen chopped spinach, thawed, drained, and squeezed dry
• 1  tablespoon lemon juice
• 1⁄4 teaspoon pepper
• 1  egg white, lightly beaten
• 3⁄4 lb lean ground lamb
• 1⁄2 cup  crumbled feta cheese
• 1⁄4 cup  chopped of fresh mint or 4  teaspoons dried mint flakes
•  cooking spray
• 4 (1 1/2ounce)  onion hamburger buns
• 1⁄2 cup diced tomato

Directions

1. Combine first 4 ingredients in a bowl; stir well.
2. Add lamb, cheese, and mint; stir well. Divide mixture into 4 equal portions, shaping into 1/2-inch-thick patties.
3. Prepare grill. Place patties on grill rack coated with cooking spray; grill 5 minutes on each side or until done.