INGREDIENTS
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1 cup heavy cream
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2 tablespoons buttermilk
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3/4 cup finely chopped onion
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6 cloves garlic, minced
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6 tablespoons vegetable or olive oil
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1/4 cup lime juice
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1/2 teaspoon ground cumin
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1/2 teaspoon dried Mexican oregano, crumbled
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2 1/2 teaspoons salt
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1 3/4 pounds flank steak, trimmed of surface fat and silverskin
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4 to 6 poblano chiles
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2 large onions, cut crosswise into 1/2-inch thick slices
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Toothpicks for securing onion slices on grill
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12 to 16 corn tortillas
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2 limes, cut into wedges, optional