The following is a recipe that I absolutely love.
(The amounts are inexact and will vary based on the size of your leg of lamb and the roasting pan. You should have that, when you put the lamb in the roasting pan and pour the liquid over it, there should be about ½ inch depth of liquid.)
1 cup dark vinegar
5 tablespoons sugar
½ cup raisins
Olive oil
Several garlic cloves, sliced
Preheat the oven to 375° F.
In a small saucepan, heat the vinegar gently, add the sugar and stir until the sugar dissolves.
Add raisins to the vinegar, take off the heat and set aside.
Drizzle the lamb with a small amount of olive oil and rub it all over.
Make several small incisions in the leg of lamb and insert a sliver of garlic in each one. (Do this to taste – I like garlic, so I use a fair bit. If you’re not a fan, just use less, but don’t leave it out altogether.)
Place the lamb in a deep roasting pan and pour over the vinegar, sugar and raisin mixture.
Cover the roasting pan with tinfoil, shiny side facing the lamb.
Put in the oven for 3½ hours.
Remove from oven, allow to rest for 10 minutes, covered, then carve and serve.
I like to throw some potatoes cut into halves or thirds into the roasting pan along with the lamb as they absorb the wonderful flavour from the sauce and the lamb drippings.
You can make a thicker gravy with the juices in the pan, but I find that the dish is rich enough that the lighter gravy you end up with at the end of the cooking time works just fine.