Preheat oven to 300 degrees F. Mix all ingredients together except the lamb and vegetables.
Make shallow cuts in the meat approximately 1/2 inch apart. Rub the paste all over the meat, taking extra care to get it deeply into the cuts you made.
Place the lamb in a baking dish with a lid.
The lamb will need approximately 4 hours to cook. It depends on the size of the lamb, how your oven functions, and how well done you like your meal.
Place the chopped vegetables into the baking dish around the lamb approximately 2 hours before you plan to take the lamb out of the oven.
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