Into large pot throw lentils, lamb, vegies (not pumpkin), sugar, tomato soup, beef stock and dried herbs. stir.
Preheat oven on 200 celcius. Then place pot in the oven covered for 40 mins (stirring once or twice).
Remove pot from oven, stir, add pumpkin and cook for another 50 - 60 mins - stirring occasionally. Take from oven take lid off and allow to stand for 10 mins.
Serve with fresh herbs and a dollop of sour cream.