Cut the avocados in half and carefully remove the pit.
Scoop out the avocado flesh and place in a medium mixing bowl.
Toss with the lime juice.
Add the salt now.
Using a fork, pasty blender or potato masher, mash until the avocado is smooth.
Fold in the diced red onion, chopped jalapeño and cilantro.
Taste the guacamole (over and over) and adjust seasonings if necessary.
Store leftovers in the refrigerator an airtight container with the avocado pit to help keep fresh.