For the Chicken Marinade:

• 2 pounds (900 g) boneless, skinless chicken thighs or chicken breasts
• 1/4 cup (60 ml) olive oil
• Juice of 2 lemons (about 1/4 cup)
• 4 garlic cloves, minced
• 2 teaspoons dried oregano
• 1 teaspoon dried thyme
• 1 teaspoon paprika
• 1 teaspoon ground cumin
• 1/2 teaspoon onion powder
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper

For the Homemade Tzatziki Sauce:

• 1½ cups (360 g) plain Greek yogurt
• 1/2 cucumber, finely grated and squeezed dry
• 2 garlic cloves, minced
• 1 tablespoon lemon juice
• 1 tablespoon olive oil
• 1 tablespoon chopped fresh dill
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper

For Assembly:

• 6 pita breads
• 2 tomatoes, sliced
• 1 small red onion, thinly sliced
• 1 cucumber, sliced
• Shredded lettuce
• Fresh parsley
• Lemon wedges