Turkey Meatball Gyros

Ingredients

• 1/2 cup cucumber
• 1 cup plain Greek nonfat yogurt
• 1/2 teaspoon garlic powder
• 1/2 teaspoon dried dill
• 1/2 teaspoon black pepper (divided use)
• 1 tablespoon lemon juice
• 1 pound ground turkey
• 1/3 cup panko breadcrumbs
• 1 large egg
• 2 garlic cloves
• 1/2 teaspoon ground cumin
• 4 whole wheat pita breads, 6-1/2-inch diameter
• 1 cup baby lettuce mix
• 4 tablespoons crumbled feta cheese