Cumin-Crusted Grilled Skirt Steak Tacos with Orange-Chile Glaze and Lime-Marinated Avocados

Directions:

1. Combine the orange juice, vinegar, tomato purée, and chipotles or chile powder in a medium saucepan and, on the stove top, bring to a boil over high heat. Reduce the heat to medium and simmer vigorously until the mixture has reduced by two-thirds and become slightly syrupy (30-40 minutes). Remove the glaze from the heat and allow to cool to room temperature.
2. While the glaze reduces, halve, pit, and peel the avocados; cut each half into thin slices. Put the avocado slices, lime juice, and cilantro in a bowl, and sprinkle with salt and pepper. Toss gently until the avocado is evenly coated, then transfer to a serving dish, cover, and set aside until serving time.
3. Build a fire in your grill. When the coals are all ignited, the flames have died down, and the temperature is hot (see Gauging the temperature), you're ready to cook.
4. Rub the steaks and onion slices with olive oil and sprinkle evenly with the cumin, paprika, and salt and pepper.
5. When the fire is ready, put the steaks on the grill directly over the coals and cook until they are done to your liking (4-5 minutes per side for medium-rare). Brush the steaks generously with the glaze during the last 45 seconds of cooking on each side.
6. To check for doneness, poke each steak with your finger to test its firmness (see The "hand method"); if you're unsure, make a cut in the thickest part of one steak and peek at the center; it should be slightly less done than you like. Transfer the steaks to a cutting board, cover loosely with foil, and allow to rest for 5 minutes. Thinly slice the steak on the bias across the grain, arrange the slices on a serving platter, and drizzle with the remaining glaze.
7. While the steaks are resting, put the tortillas around the edges of the grill and cook briefly, flipping every 10 seconds or so, until they are soft and pliable (about 1 minute). Wrap the stack of warm tortillas in a large napkin or foil, and take them to the table along with the lime-marinated avocados and the steak, so your guests can "roll their own."