Start by preparing all of your ingredients. Chop the onion and tomatoes then mince the garlic. Remove cilantro leaves from stems and give them a course chip. Squeeze the juice from the limes in a separate bowl and set aside.
In a medium bowl, remove avocados from the skin. Mash with the back of a fork or pastry blender. Add all of the prepared ingredients and stir well.
To store, squeeze some extra lime juice on top then cover with plastic wrap so the plastic is touching and covering all of the guacamole. Serve with chips or your favorite veggies.