Start by washing the tomatoes and cilantro thoroughly. Dice the tomatoes into small pieces, and finely chop the red onion. Remove the seeds from the jalapeño for less heat, if desired, and mince it finely.

In a large mixing bowl, combine the diced tomatoes, chopped onion, minced jalapeño, and cilantro.

Squeeze fresh lime juice over the mixture, then add in the salt. Stir until everything is well combined.

Give your salsa a taste! If you like it spicier, add more jalapeño. If you want more acidity, feel free to squeeze in an extra splash of lime juice.

Let the salsa chill in the refrigerator for about 10 minutes to let the flavors meld together before serving.