Select ripe avocados and slice them in half; remove the pit.
Scoop the avocado flesh into a bowl and mash it to your desired consistency.
Add the lime juice to the mashed avocado.
Finely chop the onion and add it to the bowl.
Dice the tomato and mix it into the guacamole.
Incorporate minced garlic for additional flavor.
Season with salt to taste and mix well.
For added heat, include diced jalapeño.
Taste and adjust seasoning as necessary.
Serve immediately or store in an airtight container.