Make slits in the skin of the lamb and insert garlic clove halves. Rub the leg with the olive oil, then liberally season with Robertsons spice, black pepper and soy sauce.
In a large heavy-bottomed pot add the sugar and allow it to caramelise. Add the lamb roast and sear the lamb uncovered on the stove until golden brown on both sides. See Pic Below.
Remove the leg of lamb from the pot and transfer to an oven tray.
Add a bit more oil to the pot and swirl the onions and the carrots in the pot making sure that you get all the brown bits adding about half a cup of water. Season if needed and add the orange juice. Mix well and spoon everything over the roast. See Pic Below.
Cover loosely with foil and bake at 150°C for 4-5 hours.
Make a gravy with the pan juices, thickened a little with about 2 teaspoons of cornflour mixed with water.
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Notes
If you're cooking for guests this recipe is great because everything can be prepared a day before.
Recipe by SAPeople South African Recipes at https://tastyrecipes.staging.sapeople.com/slow-roasted-leg-of-lamb/