The Best Guacamole!

3 ripe avocados, peeled and pitted
1 jalapeño, cored and finely diced (add more or less to taste)
1/2 cup finely diced red onion
1 tablespoon fresh lime juice
1/3 cup fresh cilantro leaves, finely chopped
1/2 teaspoon fine sea salt
1/4 teaspoon ground cumin
(Optional: 1 roma tomato, cored and chopped)

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!