Finely dice the red onion, mince the jalapeño (removing seeds for less heat), and finely chop the fresh cilantro. Measure out the lime juice, kosher salt, and ground cumin into small bowls or onto a plate. Having everything prepped and ready ensures smooth assembly and prevents the avocado from oxidizing while you're still chopping.

Cut each avocado in half lengthwise, working around the pit. Gently twist the halves apart and tap the pit with the flat side of a sharp knife to remove it. Using a spoon, scoop the creamy flesh directly into a medium bowl, keeping the pieces relatively chunky. I prefer to work quickly here and add the lime juice immediately to prevent browning—the acid acts as a preservative.

Pour the fresh lime juice over the scooped avocado immediately and gently fold it in using a fork or spoon, breaking down the avocado just enough to create a chunky texture—don't overwork it or you'll end up with guacamole paste. Add the diced red onion, minced jalapeño, chopped cilantro, kosher salt, and ground cumin from Step 1. Gently fold everything together until just combined, being careful not to mash the avocado too much.

Taste the guacamole and adjust the seasoning as needed—you may want more lime juice for brightness, additional salt for depth, or extra jalapeño for heat. I like to taste as I go because lime juice and salt levels can vary by brand and personal preference. Serve immediately with tortilla chips or your favorite accompaniment.