Remove and discard the cores and seeds from the tomatoes. Small dice the tomatoes until you have about 2 cups.
Finely dice the yellow onion until you have about 1/2 cup.
Very finely mince the 2 garlic cloves and fresh chili to taste.
Mix together the tomatoes, onion, garlic, and chili with salt to taste and 2 tablespoons of olive oil. Serve on the fresh sopaipillas.