Grilled butterflied lamb leg with Kentucky mop sauce

1. First, whizz the marinade ingredients in a food processor. Using a pairing knife, make a few little cuts all over the lamb leg and put it in a large ziplock bag (or a container you can cover that will fit in the fridge). Spoon in the marinade into the bag – or massage it over.
2. Expel any air from the bag, zip it up and refrigerate overnight. The next day, use kitchen towels to wipe off the excess marinade. Discard the marinade. Season the lamb with the salt and pepper and put it in a baking tray and leave to sit for at least 30-40 minutes to come to room temperature before you’re ready to cook it.

TO COOK ON YOUR BARBECUE

1. We’re going to grill this hunk of meat directly, then indirectly. Get a hot bed of coals started on one side of your grill, you’ll want it to last 1 hour at medium heat and maintain a temperature of about 160°C.
2. You may want to get a chimney starter ready so you can add more white-hot coals if the temperature starts to dip – just throw a couple in when you need it. We prefer a milder wood for lamb – any fruit wood, but cherry gives a wonderful colour to the outside of the lamb. Have 2 fist-size chunks to hand or if your using chippings, 2 large scoops. Add these, 1 chunk or 1 scoop at the start of your cook, replenish when they extinguish.
3. Remove the lamb from the roasting tray and carefully lay, fat side down, directly over the coals. Sear for about 4 minutes, then
4. flip it over, and sear again for a further 4 minutes. Now, slide the meat over to the opposite side of the BBQ, fat side up, away from the coals, and close the lid. Put in a fist-size chunk of smoking wood, any fruit variety or oak works well directly on the coals. A piece of lamb that weighs 2kg will take about 1 hour or so for a nice medium rare. After an hour, insert an instant-read thermometer, and if it reads 52-54°C, your lamb is ready. Carefully remove and allow the lamb to rest, covered loosely in foil, for 20 minutes. Resting phase is important and will continue to cook during this period.
5. To make the Kentucky mop sauce, heat all the ingredients with 150ml water in a saucepan over medium-low heat. There’s a lot of vinegar in this, so be careful of the fumes. Allow to simmer gently for around 15-20 minutes, until reduced by about a third and thickened to a loose gravy consistency. It is a pungent sauce, but trust us, it really works with lamb, mutton or hogget. Season to taste.
6. To serve, thinly slice the lamb and arrange on a serving plate or tray. Drizzle some sauce over the slices of lamb and serve the rest of the sauce on the side for extra dipping.

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