1. Finely dice the cilantro, red onion, and jalapeno (remove seeds for less heat). Then, put all ingredients into a small mixing bowl.
2. Use a fork to mash the avocados until no large chunks are left. Some smaller chunks are good for adding texture to the guacamole.
3. Taste and add more salt, if needed, then serve. Leftovers keep well in the fridge for up to 3 days. I recommend covering the guacamole in plastic wrap with the plastic touching the surface of the guac to keep air out. This will help prevent browning.
Notes
*Ripe avocados should be soft, yet still slightly firm. If the avocado is already mushy and/or brown inside, it's overripe and won't taste great here!