Place the avocados into a large bowl and mash well. I use a potato masher, but you can also use a wooden spoon or a fork.
Fold in the jalapeño, chopped cilantro, lime and salt. Season to taste, adding more salt and lime juice as desired. If using tomatoes, fold in at the end.
Notes
I sometimes like to add tomato in this guacamole recipe. If you want to add a tomato, core and seed the a medium tomato and then finely chopped. Fold into the guacamole at the end.