Finely chop the red onion, cilantro, jalapeno and tomato.  If you want a mild guacamole, remove the seeds of the jalapeno before chopping.

Run the garlic cloves through a garlic press.  If you don't have a garlic press and want to chop manually, reduce to 2 cloves.  (The garlic press leaves some garlic behind so I use more)

In a medium bowl, mash the avocados until desired consistency.  I actually use a pastry blender which keeps it a little chunky.  You can use a fork as well.

Add the chopped vegetables to the mashed avocados and blend.

Add the sea salt and the juice of the lime.  

Combine all ingredients, cover and put in the refrigerator.