
In a medium bowl, combine the lime juice, onion, and salt. Let sit for 5 minutes.
Meanwhile, halve the avocados lengthwise and remove the pits. Using a spoon, scrape the flesh of the avocado into the bowl with the onion mixture. With a fork, or potato masher, mash the avocados, making sure to leave it relatively chunky.
Add the tomatoes, cilantro, and jalapeño and stir together. Serve with tortilla chips and fresh veggies for dipping.