01 -
Preheat oven to 160°C. Pat the lamb dry using paper towel, then liberally season on all sides with salt and ground black pepper.
02 -
In a large frying pan or suitable roasting tray, heat olive oil over medium heat. Sear the lamb leg for several minutes, turning once to achieve even browning.
03 -
Arrange the lamb fat side up in the roasting tray. Scatter onion wedges, garlic cloves, rosemary sprigs, and dried muscatel grapes around the lamb. Pour in 1 cup red wine and 1 cup chicken stock. Cover tightly with aluminium foil and roast for 3 hours.
04 -
After 3 hours, add 1.5 cups water to the tray. Recover with foil and continue roasting for 1.5 more hours.
05 -
Remove foil, baste lamb generously with pan juices, and if needed add an extra cup of water if liquid has reduced significantly. Roast uncovered for a further 30 minutes.
06 -
Transfer the lamb to a platter, tent with foil and a tea towel to retain heat. Allow to rest for 30 minutes for optimal tenderness.
07 -
Strain the roasting juices along with aromatics into a saucepan. Skim off surface fat. Add 1/2 cup red wine, 1 cup chicken stock, and 1/2 tablespoon brown sugar. Simmer for 10 minutes. Strain through a fine sieve, return to saucepan, and finish by whisking in 1 tablespoon salted butter. Season to taste.
08 -
Pull the lamb apart using two forks. Arrange on a serving platter, garnish with the rehydrated grapes and fresh herbs if desired. Drizzle with some of the red wine sauce and serve the remainder alongside.