Add the avocado to a bowl. Keep it chunky or mash it with a fork or potato masher.
Add the chopped tomato, jalapeño, red onion, cilantro, lime juice, salt, and pepper.
Mix everything and taste. Adjust to your preferences. Add more salt or extra lime juice if needed.
Notes
You can control the texture by the size of the avocado chunks and whether you mash them or not.Skip the jalapeño to omit the heat or try habanero peppers for even more spice.