Soak the wheat overnight in plenty of water and then drain. In a large, heavy bottomed pot (or special harees pot), place the wheat with the lamb, salt, pepper and cinnamon sticks. Add enough hot water so that it is about 5cm above the wheat and meat mixture. Place a damp cloth or aluminium foil over the pot and cover with a tight lid. Bring to a boil, reduce the heat and cook on a very low heat for 2-3 hrs, stirring occasionally to skim off the froth or fat from the surface. Once the wheat is soft and most of the water has been absorbed, remove from heat and allow to cool (If all the water has been absorbed add about 1 cup of boiling water; if there is too much water but the wheat is cooked, ladle out the excess water).