Grilled Gyro Burgers Recipe

Ingredients

• 2 (8 ounce) containers plain yogurt, divided
• 1 (1 ounce) package dry Ranch-style dressing mix
• 1 cucumber, peeled, seeded, and chopped
• 1.5 pounds ground beef
• 0.25 cup diced onion
• 6 pita bread rounds
• 2 cups torn lettuce leaves
• 1 tomato, seeded and diced