4 ripe, avocados, seeded, peeled, cut in chunks <br />1 tsp lemon juice <br />1/2small sweet white onion, minced <br />1 ripe Roma tomato, seeded and diced <br />Salt and pepper, to taste <br /> Mash avocados with lemon juice in a bowl, leaving some chunks. <br /> Gently stir in remaining ingredients and serve immediately.