Halve the avocados, remove the pits, and scoop the flesh into a bowl.
In a pestle and mortar, add the salt, garlic, and minced jalapeño. Grind them together until you have a rough paste. This step helps to release the flavors and aroma of the garlic and jalapeño.
Add the avocado flesh to the pestle and mortar. Mash the avocado into the garlic and jalapeño mixture until you reach your desired consistency. You can leave it chunky or make it smoother according to your preference.
Transfer the mashed avocado mixture to a mixing bowl (if using). Add the diced tomato, chopped red onion, and cilantro. Stir gently to combine.
Squeeze the juice of one lime over the guacamole. Stir well to combine and adjust salt if needed.
Serve immediately with tortilla chips, as a side for tacos, or as a topping for your favorite dishes.