In a large bowl, combine the onion, jalapeño, cilantro, 3/4 teaspoon salt, and 1/2 teaspoon pepper. Using the back of a fork, mash the vegetables until they begin to release their juices.
Add the avocados and lime juice and stir to combine. This recipe makes 2 cups.
Quick Tip: Got leftover cilantro? It’s a great, versatile herb you can add to tons of recipes. Snip the ends and store cilantro in a jar or glass of water. Loosely place a plastic bag over the glass (like a bag you get in the produce section of the grocery store) & store in the fridge for up to two weeks!