On a gas range or under a broiler, roast the green, red and poblano peppers until well charred. Let cool. Stem and seed the charred peppers. Coarsely chop and set aside.
In a spice grinder or with a mortar and pestle, finely grind the whole guajillo and pasilla chiles and set aside.
In a large saucepan, warm the oil over medium heat. Add the onions and cook, covered, 3 to 5 minutes. Add the guajillo and pasilla chiles, cumin, chili powder, oregano, thyme, black pepper, salt and garlic. Stir and cook until the spices become fragrant and are fully coated in oil, 3 to 5 minutes.
Add the tomatoes, green chiles and sugar. Stir and continue to cook until the sauce starts to simmer. Reduce the heat to medium-low and continue to cook until the vegetables soften and the flavors come together, 30 to 40 minutes. Taste and add additional salt and pepper as needed.
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This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Lone Star Taco Bar, Allston, MA
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