Cut the avocados in half, remove the seeds and place them aside (do NOT throw them away)
Spoon out the avocado from the peels and place them in a bowl
Using a fork, mash the avocado and add lemon juice and sour cream to the bowl
Mix well
Add tomatoes, onion, cilantro and salt to the bowl and mix thoroughly
Add the seeds back to the guacamole to prevent it from turning brown
Serve with your choice of nacho chips and other salsas
NOTE: If you don’t plan on serving the guacamole immediately, seal it in an air-tight container immediately after adding the seeds so it doesn’t turn brown.