De-pit and cut up the avocado and put pieces in a medium-sized bowl.
Use the back of your fork or a potato masher to mash your mixture together until chunky but more cohesive.
Add in the tomatoes, onion, juice of your lime, cumin, and salt and pepper. If you like cilantro, add in your cilantro. Stir everything around, and then serve.
Add in a few dashes of hot sauce or some chopped jalapeños if you like it hot.