Ground Lamb Kebabs With Sumac Relish
Preheat a grill to medium-high heat and brush it with oil. Roast the poblano chiles over the grill. Keep turning so the skin is evenly charred, without burning and drying out the flesh. Transfer charred peppers to a plastic bag, tie the top closed and let steam until cool to the touch, about 15 minutes. Peel off the charred skin by hand. Cut away stems, seeds and veins, and halve them.