Preheat oven to 180°C. Coat a 2 litre baking dish with non-stick cooking spray.
Mix together sweet potato, evaporated milk, oil, brown sugar, orange juice concentrate, ginger, cloves, allspice, salt, egg and egg whites in a large bowl. Pour into the baking dish. Cover dish with aluminium foil.
Bake for 1 hour 30 minutes. Sprinkle with coconut. Bake, uncovered, until the centre is set and coconut turns golden, about 30 minutes.