1/4cupIrish cheese (such as Dubliner(R)) or sharp cheddar shredded
Preheat the oven to 400 degrees F.
Peel and chop the potatoes in medium pieces and boil them in water. While waiting on that, begin to make the meat mixture.
Place oil and butter in large pan over medium heat. Saute the onions in the butter and oil mix. Add lamb to brown the meat. Then add the cayenne, cinnamon, paprika, and garlic. Stir it in then add the broth and worcestershire sauce. Then begin to stir in the flour till it's well incorporated into the mixture.
Drain the potatoes and return them to the pot to mash them up. Add the milk, butter and stir them all together. Add the cheeses and blend them until melted.
Spray a 9x12 baking dish with oil and place a layer of the mashed potatoes on the bottom. Then add the vegetables leaving about 1/4 of an inch border around the pan open. Then add a layer of the meat on top of the veggies keeping the border. Finally add a layer of mashed potatoes to fill in the sides and top. Top the final layer with 1/4 cup of the shredded cheese and place in the oven.
Cook for 25 - 30 minutes until the top is browned.
Sometimes you may want to kick the oven into broil mode for 2 minutes if it hasn't browned.