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While the beans are cooking, wash all the peppers then line them in the center of a baking sheet.
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Roast the peppers on the stovetop on medium high heat. A gas stove works the best but it will work fine on an electric stove. Char the peppers on all sides turning with a pair of tongs. When good and charred, steam them for 10 minutes in a covered dish or a paper bag rolled shut to hold in the steam.
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Take a paper towel and rub off the char. It’s ok to leave a little of the char. Slice in half and remove the seeds and stems.
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* If you like it spicy leave the seeds in the Serrano pepper.