Skirt steak is brushed with a mix of pantry staples, including hoisin, honey, ketchup and sambal oelek, to pump up its rich, savory qualities while also adding sweetness and spice. Pair it with grilled mushrooms and cauliflower for a satisfying supper.
Preheat a grill to medium high. Combine the hoisin sauce, ketchup, vinegar, ginger, honey and sambal oelek in a small bowl. Season the steak with salt and pepper. Brush about half of the hoisin sauce mixture all over the steak.
Put the cauliflower and 1 tablespoon water in a large microwave-safe bowl, cover and microwave until the cauliflower is crisp-tender, 5 minutes. Blot dry. Toss the cauliflower and mushrooms with the vegetable oil and 3/4 teaspoon salt; spread out in a grill basket.
Oil the grill grates. Grill the steaks until well marked, 3 to 4 minutes per side for medium rare, brushing with the remaining hoisin sauce mixture during the last minute of cooking. Transfer to a cutting board to rest. Meanwhile, grill the vegetables, tossing occasionally, until browned around the edges and crisp-tender, about 8 minutes, adding the larger scallion pieces to the grill basket during the last 2 minutes of cooking.
Divide the vegetables among plates. Slice the steaks, add to the plates and sprinkle with the thinly sliced scallions.