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1/2 cup vegetable oil
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4 medium onions, sliced lengthwise 1/8 inch thick
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4 tablespoons unsalted butter
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2 jalapeños, thinly sliced
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Juice of 4 limes
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Salt and freshly ground black pepper
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4 pounds fresh chorizo sausages
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Cilantro sprigs, for garnish
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In a large skillet, heat the vegetable oil. Add the sliced onions and cook over low heat, stirring occasionally, until they are browned, about 1 hour. Stir in the butter, jalapeños and lime juice and season with salt and black pepper.
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Light a grill. Grill the chorizo over moderately high heat, turning, until the sausages are browned all over and cooked throughout, about 15 minutes. Transfer the sausages to a platter and top with the caramelized onions. Garnish with the cilantro sprigs and serve.
Make Ahead
The cooked onions can be refrigerated for up to 2 days. Reheat them gently before serving.
Notes
Unlike Spanish chorizo, which is usually smoked and/or dried, fresh Mexican chorizo is uncooked. It can be found at grocery stores like Whole Foods.
Suggested Pairing
A substantial Pinot Noir is an ideal choice for spicy foods like grilled chorizo. Try one from the Santa Rita Hills appellation of Santa Barbara County.