In a large bowl, mix onion, lime juice, and salt. Set aside while you chop and prepare everything else.
Add avocado to bowl and mash with a fork, pastry cutter, or potato masher until only small chunks remain (or completely smooth, depending on your preference).
Add jalapeño and cilantro, stir to combine.
Serve immediately.
Video
Notes
Nutrition information is for guacamole only and does not include chips.
Makes about 2 cups but yield depends somewhat on the size of your avocados. This recipe can easily be doubled or halved, depending on how many avocados you have.
Substitutions: lemon juice for the lime juice, parsley for cilantro, green onion for the red onion.
Add-ins: chopped tomatoes, garlic, ground cumin, coriander, or cayenne, or whatever you like. Crumbled cooked bacon is really yummy too!