Preheat the oven on the highest broil setting.
Arrange the tomatoes, onion and garlic on a sheet tray, cut-side down. Drizzle with some olive oil. Broil the vegetables until charred, for 15-20 minutes.
4 Roma tomatoes, 1 Sweet onion, 4 cloves Garlic, 1 Jalapeño pepper
Once the vegetables are charred, remove from the oven and let them cool for 10 minutes, or until room temperature.
Add the vegetables to a blender or food processor, with the remaining ingredients. Pulse until your desired consistency, and serve.
4 Roma tomatoes, 1 Sweet onion, 4 cloves Garlic, 1 Jalapeño pepper, 1 Chipotle pepper, 1 Lime, ½ cup Cilantro, Salt to taste