Combine the butter, apple cider vinegar, red pepper flakes and a tablespoon of salt in a small bowl
microwave and stir 10 seconds at a time until butter is melted and salt is dissolved
The Cook
Trim the lamb & season with 1 tablespoon of salt & 2 tablespoons of pepper leaving 1 hour at room temp before smoking
Heat the smoker to 250F/135C and add soaked wood chips
Brush grates with oil and place the lamb with the fat side on top. Leave to smoke until the bone is at 190F/88C (roughly 8 hours) basting at hour 4, 6 and 7.
Take out Lamb leg and let rest 1 hour before serving
Notes
Soaking the lamb in buttermilk beforehand helps reduce gamey flavor
Chilean lamb is much gamier while New Zealand lamb is milder