Prepare the guacamole add-ins first. Juice the lime. Finely dice the tomatoes, jalapeño (remove seeds), and red onion. Roughly chop the cilantro.
Remove the peels and pits from the avocados. Place the avocados in a bowl, then mash them with a fork.
Add the diced tomato, onion, and jalapeño to the mashed avocados, along with the chopped cilantro, about 1 Tbsp of lime juice and ¼ tsp salt.
Stir the ingredients together, then taste the guacamole. Add more lime and salt to your liking. I usually end up adding about 2 Tbsp lime juice and ½ tsp salt total. Serve and enjoy!