Combine the seasoning mix ingredients in a bowl; mix well.
Remove most of the fat from the lamb and cut the lamb into 2 inch cubes.
Toss the lamb with the seasoning mix and set aside.
In a 13x9 inch roasting pan , combine the melted butter, 2 1/2 c. of onions, the margarine, 1/4 c. of the jalapeno peppers, the red pepper, ginger, cumin and coriander; mix well.
Bake at 350 degrees F on the floor of the ovenuntil the onions are dark brown but not burned, about 30 - 40 min.
Remove from the oven; stir in the remaining2 c. of onions, the bell peppers, the remaining 1/4 c. of jalapeno peppers, the curry pwdr and the softened butter, stirring well till well combined.
Place in the middle rack of the oven and bake 20 min.
Remove pan from oven; fold in the lamb, bananas, cream of coconut, pecans and raisins.
Return to the oven and bake 2hrs more,stirring every 30 min or possibly so.
Serve immediately.
To serve, spoon 3/4 c. of rice around the edges of each serving plate and mound about 1 1/4 c. lamb curry in the centre.