Remove seed and set aside for rooting project.
Break up avocado using a fork. Gently mash to remove the lumps.
Add chopped tomatoes .
Add onion sparingly to desired taste. and onion. I didn't use an entire onion because I didn't want the onion to overpower the guacamole flavor.
Mix well but gently.
Add salt and pepper to taste and chill for at least an hour.
Serve with chips and salsa.