Quarter the tomatillos and tomato. Roughly chop the yellow bell pepper into similarly sized pieces. Wrap tomatillos, tomato, and peppers in foil and roast in the oven for 20-25 minutes at 400 degrees F.
While the tomatillos are baking, finely chop cilantro. Mince garlic. When tomatillos are done, add them to a food processor along with the onion, garlic, and lime. Using the S blade, pulse 2-3 times to leave the salsa chunky but well-blended.
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