Use either a bone-in or boneless roast—plan for less meat if there is a bone. If you’re worried about being home in time to add the potatoes (this is a great recipe to throw together before leaving for work), you can par-cook them in the microwave till nearly tender before adding them to the slow cooker. Allow an hour of cook time, so they absorb the flavor of the cooking juices.
Want a light gravy? Once you remove the pork, potatoes and onions to a platter, pour the juices into a medium saucepan. Dissolve 1 to 2 tablespoons cornstarch in 3-4 tablespoons water; stir into saucepan. Bring mixture to a boil; cook until thickened. Stir in olives and a spoonful of small capers if you’d like, then season with salt and pepper, to taste
If you’d rather braise the meat in the oven, layer the ingredients in a large, deep covered casserole. Place in a 325-degree oven for about 4 hours, adding the potatoes during the last hour or so.