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Grilled Skirt Steak Tacos With Caramelized Onions

Makes 12 tacos, serving 4 as a light meal

1. Marinate the meat. In a food processor or blender, combine 1/4 of the onion, the garlic, lime juice, cumin and 1/2 teaspoon salt. Process to a smooth puree. Place the skirt steak in a non-aluminum baking dish. Using a spoon, smear the marinade over both sides of the skirt steak. Cover and refrigerate 1 hour or up to 8 hours.

2. Caramelize the onions. Heat a gas grill to medium-high or light a charcoal fire and let it burn just until the coals are covered with gray ash. Either turn the burner(s) in the center of the grill to medium-low or bank the coals to one side of the grill for indirect cooking.

Brush or spray the remaining onion slices with oil and sprinkle with salt. Lay the whole rounds of onions on the grill, not over direct heat. When they start to soften and brown, about 10 minutes, use a spatula to flip them and brown the other side. Remove from the grill and break onions into rings.

3. Grill the meat. While the onions are browning, remove the steak from the marinade and gently shake off the excess. Oil the steak well on both sides, and lay it over the hottest part of the grill or directly over the coals. Grill, turning once, until richly browned and done to your liking, about 2-3 minutes per side for medium. Remove to a cooling rack set over a large plate — this keeps the juices in the meat rather than running out. Let the steaks rest until the onions have finished grilling.

4. Serve the tacos. Cut the long piece of skirt steak into 3- to 4-inch sections, then cut each section into thin strips across the grain (that is, in line with the full length of the skirt steak). Mix with the onions, season with a little salt and set on the table, along with the lime wedges, roasted tomatillo guacamole (see recipe below) and hot tortillas, for your guests to make into soft tacos.

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