– 3 naan flatbreads – ½ cup red onion, thinly sliced – 1 cucumber, chopped – 1 avocado, cubed – 2 roma tomatoes, chopped – 1 lemon, juiced – Salt and pepper (to taste) – ⅓ cup feta, crumbled – 1 teaspoon olive oil – 1 teaspoon red wine vinegar