Start by dicing the red onion in small pieces as well as the tomato and set aside. For the avocados remove the skin from the avocados and place the peeled avocado in a bowl. Start smashing them with a fork until majority of the lumps are gone. Then add in the red onion and tomato and mix well. Add salt to taste and the lime juice. Its ready to eat.
Notes
Add the seed of one avocado to the guacamole to help keep it from browning. Stored in airtight container in fridge for 3 days.