In the bottom of the casserole dish arrange a layer of one-third of the potatoes and cover with a layer of chops topped with a third of the parsley-thyme mixture. Add a layer of half the onions, then a third more potatoes, the remaining chops, herbs, remaining onions, and finally, the remaining potatoes and herbs. Season well with salt and pepper and add the water. Cover and cook the stew in the preheated over for 2 to 2- half hours, or until the meal is tender and the potatoes and onions are soft. Serve in soup plates with a sprinkling of parsley on top, and drink beer with with if you'd like. Irish stew always benefits from being cooked the day before and allowed to cool thoroughly. You may refrigerate. Skim off any fat and reheat the stew before serving.