Gather all of your ingredients.
Prepare the ingredients by pitting the avocado, dice up your onion, tomatoe, cilantro, and cut your lime
Peel the skin off the avocado and place the avocado in a bowl
Begin to mash the avocado with a masher until fully mashed.
Add your cilantro and your lime.
Put a bit of salt on top.
Mix all of that up.
Cover in plastic wrap and store in fridge if necesary.