Avocado Tomato Corn Salad - Cafe Delites

1 cup romaine, (or Cos lettuce) shredded 2 ounces corn kernels, drained 2 large ripe avocados, halved peeled stones removed and diced 9 ounces grape tomatoes, halved ⅛ red onion, thinly sliced 2 tablespoons lime juice 2 tablespoons extra virgin olive oil 2 tablespoons cilantro ½ teaspoon salt, to season ⅓ teaspoon red chili flakes 1 pinch of cumin 1 clove garlic, minced (optional)