Place the Roma tomatoes whole, Garlic cloves, whole jalapenos, and white onion (halved), on a slotted grill pan.
Roast on the grill for about 20 minutes until the tomatoes and onion became soft. If you want to do this in the oven, you can place everything on a rimmed baking sheet and broil for a few minutes until the tomatoes and jalapeno become blistered.
Allow to cool and place in blender with lime juice, fish sauce, and cilantro. Blend until desired consistency is reached and taste. I added a dash of salt to bring out more flavor.
Pour into jars with lids and place in refrigerator to cool. Airtight jars will store the salsa for about a week in the refrigerator.
Nutritional information is provided as an estimate only and depends on ingredients and amounts used. Thai Caliente makes no guarantees to the accuracy of this information.