Half the tomatoes and jalapeño, quarter the onion and garlic cloves with the skin and on place on a baking sheet. Make sure that tomatoes and jalapeños are skin side up on the baking sheet.
Lightly coat with oil, season with salt and broil for 4 minutes.
Remove the garlic and then increase the heat to high broil and broil for 5 minutes.
Remove the garlic skins and add all the ingredients into the food processor, including all the juices from the roasting pan.
Pulse until the salsa is your prefered consistancy.