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Place all marinade ingredients into a chopper and chop to a fine paste.
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Divide the mixture into two equal halves.
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Smear half the mixture on the lamb leg and massage it in for 5 minutes.
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Keep the marinated meat in a glass container and cover with cling film.
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Refrigerate for 24 hours.
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Reserve the other half of the mixture for the sauce by putting it in an airtight container and placing it in the fridge overnight.
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Next day, take the lamb leg out of the fridge at least 1 hour before cooking to let it come to room temperature.
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Preheat the oven to 200˚C (400˚F).
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Heat ½ a cup of mustard oil in a large pan and fry the mutton leg on medium heat, to brown on all sides. Reserve the oil for preparing the sauce.
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Place the mutton leg on a baking tray, and cover it with foil.
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Bake for 1½ to 2 hours, depending on the size of your lamb leg.
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It should be done when the meat is pulling away from the bone.
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Insert a knife at the thicker part of the leg and, if the juices run clear, you know it’s done.
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Brush the leg with the reserved oil and bake again, uncovered, for 15 to 20 minutes, turning a couple of times so that the meat is slightly charred on the surface.
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This will mimic the flavour and look of cooking it over coals. While the meat is roasting, let’s prepare the sauce. Heat the reserved mustard oil on medium heat and sauté the cinnamon, cloves and whole cardamoms for 1-2 minutes.
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Add the reserved marinade and cook for 5 minutes until there is a clear separation of the oil and the green sauce.
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Add about 60 ml (¼ cup) of water and cook for a minute more.
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You are looking for a sauce of pouring consistency. Pour the sauce onto a plate and sit the roasted leg on it.