- In a medium mixing bowl, use a fork or a potato masher to mash the avocados to your desired consistency.
- Stir in the jalapeño, onion, lime juice, cilantro, salt, cumin until well-mixed. (If adding tomatoes, stir them in at the very end.)
- Taste and season with extra salt (plus extra lime juice, jalapeño and/or cilantro) if needed.
- Serve immediately and enjoy!