Halve the avocados and scoop the flesh out into a large bowl. Mash quickly with a fork or potato masher, leaving some chunks.
Dice the tomato and onion and add to the bowl with the avocados. Depending on the size of the onion, I usually start with a quarter and see how that looks, then add a bit more if necessary.
Juice 1 lime over the bowl, sprinkle ½ tsp salt over, and stir to combine. Taste test, then add up to 1 more lime and another ½ tsp of salt to suit your tastes.
Serve with tortilla chips or however your prefer!
Recipe by Coffee & Quinoa at https://www.coffeeandquinoa.com/2012/11/simple-guacamole/