Cut the tomatoes in half and remove the seeds, then finely dice them and transfer to a large mixing bowl. Peel and finely chop the onion. Roughly chop the cilantro and mint, and thinly slice the jalapeno after removing the seeds and membrane.

Rinse the lemon well, cut it in half, and squeeze the juice into a small bowl, removing any seeds as needed.

Add the onion, herbs, and chili to the tomatoes. Sprinkle in the seasonings and toss everything together until combined.

Pour the fresh lemon juice over the mixture and stir well so the ingredients and seasonings are evenly distributed throughout the salsa.

Cover the bowl and refrigerate for at least 30 minutes to allow the flavors to blend. Stir once more before serving.