Transport yourself to the sunny shores of Greece with this flavorful Greek tuna salad recipe. Start by combining drained tuna, diced cucumber, cherry tomatoes, sliced red onion, crumbled feta cheese, and Kalamata olives in a bowl. In a separate small bowl, whisk together olive oil, lemon juice, dried oregano, salt, and pepper to make the dressing. Pour the dressing over the tuna mixture and toss gently to coat. Let the flavors meld together for a few minutes before serving. This Greek tuna salad is fresh, tangy, and perfect for a light and refreshing meal.