In its most simple form mostly avocado, onions and salt, season with lemon and sugar to taste. The thing is, preparation matters and if you mush the onions in a mortar it gets a more distinct onion flavor, something about broken cell walls and enzymes, so I dug out my trusty granite mortar and pestle. Served the guacamole in a cheeseburger. I have a fondness for cheeseburgers, can you tell? Shoutout to Quiz for the original inspiration.