Grip an avocado gently on one side with your hand. Using a large, sharp knife in the other hand, cut the avocado lengthwise around the seed. Open the two halves to expose the pit.
Gently tap the pit with the knife with enough force so that the knife edge wedges into the pit, but not so hard as to cut all the way through.
Test the knife remove the pit and discard.
Scoop our the flesh of the avocado and place in mixing bowl.
Using a fork, roughly mash the avocado. (Don't overdo it! Guacamole should be a little chunky.)
Add the rest of the ingredients (prepared as noted in the ingredients) and stir to combine. NOTE the salt and pepper are to taste.
Serve immediately or cover and refrigerate until serving.