Cucumber, Tomato and Avocado Salad

Roma tomatoes, chopped

English cucumber, sliced

medium red onion, sliced

avocados, diced

extra virgin olive oil (or sunflower oil)

medium lemon juiced (about 2 tablespoons)

(1/2 bunch) cilantro, chopped

sea salt (or 3/4 teaspoons table salt)

black pepper