Prepare the Avocados: Cut the avocados in half, remove the pits, but save one pit for later, and scoop the flesh into a bowl. Mash them roughly with a fork, leaving some chunks for texture. If using the molcajete, you will do all the mashing at the end.
Add Fresh Ingredients: Mix in the chopped onion, diced jalapeño, and chopped cilantro.
Season: Add the lime juice and salt.
Mix and Taste: Stir everything together. Taste and adjust salt and lime juice as needed. If using the molcajete, you will stir roughly to bring out the flavors of the onion and jalapeño
Serve Immediately: Guacamole is best enjoyed fresh. One tip to keep your guac fresh for longer is to throw an avocado pit into the guac bowl—it's a little family trick.