• 1 1/2 pounds boneless, skinless chicken thighs
• 1/4 cup olive oil
• 2 tablespoons lemon juice
• 2 cloves garlic, minced
• 1 teaspoon dried oregano
• Salt and pepper to taste

For the Tzatziki Sauce:

• 1 cup Greek yogurt
• 1/2 cucumber, grated
• 2 cloves garlic, minced
• 1 tablespoon lemon juice
• 1 tablespoon olive oil
• Salt and pepper to taste

For the Gyros:

• 4 pita breads
• 1 small red onion, thinly sliced
• 1 tomato, chopped
• 1/4 cup fresh parsley, chopped