Step 1

Soak the onion in cold water for 15 minutes. Drain and transfer to a large bowl.

Step 2

On a cutting board, lightly sprinkle the garlic with 1/4 teaspoon of salt and smash it into a paste with the side of a cook's knife. Transfer the paste to the bowl with the onion.

Step 3

Using a knife cut the avocados in half, rotating around the seeds. Remove the seeds and discard. Using the knife, carefully make several slashes in the avocado flesh. Using a spoon, scoop the avocado flesh into the bowl with the onion and garlic. Repeat with the remaining avocado.

Step 4

Add the lime juice, cilantro, tomato, and jalapeno, to taste, to the avocados. Using a rubber spatula or large fork, mix until just combined, keeping the guacamole chunky. Season with salt, to taste. Serve immediately.