1 jalapeno, stem and seeds removed, minced (add more or less to taste)
1/2 cup finely chopped red onion
1 Tbsp. fresh lime juice
1/4 cup fresh cilantro leaves, finely chopped
1/2 tsp. coarse sea salt
dash of cumin
(Optional: 1 roma tomato, cored and chopped)
Mash together avocados, jalapeno, onion, lime juice, cilantro, salt, cumin with a fork until well-mixed. (If adding tomatoes, stir them in at the very end.) Serve immediately, or cover the bowl with plastic wrap (so that the plastic is literally touching the entire top layer of the guacamole) and refrigerate.