Prepare the avocados by cutting them in half lengthwise and removing the pits. Scoop the flesh into a medium bowl and mash with a fork to your desired consistency—chunky or smooth.
Finely dice the tomato, onion, and drained jalapeño peppers.
Add them to the bowl with the mashed avocado.
Add the fresh lime juice, salt, and black pepper.
Stir everything together until just combined.
Serve immediately for the best flavor and color.
Don't overmix!
Stir the until they are just combined to maintain a good texture and prevent the guacamole from becoming mushy.
Taste and adjust seasonings right before serving. You may need an extra pinch of salt or a squeeze of lime to make the flavors pop.