Possible Clues:

• *Greek yogurt sauce
• Sauce on a gyro (... first 2)
• Greek sauce with yogurt and cucumbers
• Sauce made with yogurt and cucumbers
• Greek dip with chopped cucumber and mint
• Greek dish of yoghurt and cucumber
• Greek yogurt dish
• Greek dip made using yogurt, chopped cucumber and mint
• Greek dish of yogurt, cucumber, garlic
• Gyro sauce