Heat one tablespoon of the oil in a pan and gently fry the onion for 3-4 minutes, until softened. Add the spices and bay leaf and fry for another 1-2 minutes. Stir in the rice, coating with the oil and spices.
In a small bowl, dissolve the stock cube in the boiling water and pour into the pan with the rice. Stir once, cover with a lid and bring to a gentle simmer.
Heat the remaining oil in another pan and fry the lamb chunks for 1-2 minutes, or until golden-brown. Add to the rice, turn the heat down to low and cook, covered, for 10-12 minutes, until the rice is tender.
Pile the rice into a serving bowl and garnish with the coriander leaves.