In a mixing bowl place peeled, quartered and seeded avocados.
Mash with a potato masher or fork until smooth.
Add the remaining ingredients and combine with a fork.
Mound on a bed of shredded lettuce.
Notes
You can keep stored skinned avocados or guacamole from browning by sealing them with a vacuum sealer. It prevents oxygen from causing the oxidization that causes off flavors and browning.