Slice the top portion of the avocados to remove the small seed, slice avocados in half lengthwise.
Remove avocado pits and spoon avocado into the bowl. Mash the avocados with a fork until desired texture is reached, preferably still lumpy.
Chop your onions, tomato, and cilantro and add to mashed avocado. Season with salt and lime juice, stir to combine.