Rinse the tomatoes thoroughly and chop them into small, even pieces, about 1/4 inch in size. Place the chopped tomatoes into a mixing bowl.
Finely dice the red onion and add it to the bowl with the tomatoes, mixing in for an even distribution.
Chop the fresh cilantro finely and sprinkle it over the mixture, then stir gently to incorporate all the herbs.
Squeeze fresh lime juice over the mixture, then add the salt, tasting and adjusting as needed for brightness.
Use a spoon to gently fold everything together, ensuring the flavors are evenly distributed without mashing the ingredients.
Let the salsa rest for a few minutes at room temperature to allow the flavors to meld and the texture to settle.
Give the salsa a final stir, then transfer it to a serving bowl or dish. Serve immediately with chips, grilled items, or as a fresh topping.