Start by juicing the lime, using that fresh juice in your guacamole mixture.
Pit and peel your avocados and then mash them. You can use the mortar and pestle for that, if they are big enough.
Mash your lime juice, salt, and avocados together in a medium bowl, and then mix in the rest of the ingredients.
Place the guacamole in the fridge for at least an hour before you serve it. You can add in cayenne pepper or hot sauce to Mexican mortar and pestle recipes like this to give them a little spicy kick.