For the chicken:

• 1 1/2 pounds boneless skinless chicken thighs or breasts
• 3 tablespoons olive oil
• juice of 1 lemon
• 3 cloves garlic (minced)
• 1 tablespoon plain Greek yogurt
• 1 tablespoon red wine vinegar
• 1 tablespoon dried oregano
• 1 teaspoon salt
• 1/2 teaspoon black pepper

For the tzatziki:

• 1 cup plain Greek yogurt
• 1/2 English cucumber (grated and squeezed dry)
• 1 clove garlic (minced)
• 1 tablespoon olive oil
• 1 tablespoon lemon juice
• 1 tablespoon chopped fresh dill
• salt and pepper to taste

For serving:

• 4–6 warm pita breads
• sliced tomatoes
• shredded lettuce
• sliced red onion
• crumbled feta cheese
• fresh parsley (optional)