Cut the tomatoes in half, remove some of the seeds and excess juice, and dice the flesh into small pieces.
Transfer the tomatoes to a mixing bowl and add the finely diced red onion.
Stir in the minced jalapeño and chopped cilantro, distributing both ingredients evenly.
Pour the lime and lemon juices over the vegetables, then sprinkle in the salt.
Fold the ingredients together gently and let the salsa rest for about 15 minutes.
Taste, adjust the citrus or salt, and serve with a slotted spoon if excess liquid collects.
