– Place the peppers, tomatoes, and garlic clove on a hot griddle. Roast all for about 2-3 minutes per side (except the garlic) until they are well roasted. The garlic will take less time to roast, about 2 minutes, so remove and let the tomatoes and peppers finish roasting.
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Once all of these have been roasted, wrap them in aluminum foil and let rest for 5 minutes. This will allow the remaining heat to finish cooking through the ingredients.
– Add the garlic clove, tomatoes, and peppers to your blender or food processor pitcher. Process until you have a chunky salsa (or you can make it smoother if you like). Season with salt, and let it cool for about 5 minutes before stirring in the chopped onion and cilantro.