I'm not sure this is the healthiest thing ever but it was really good. It definitely overcame the slow-cooker's tendency to suck the flavor out of everything.
½ pound dried small white beans (I used black eyed peas)
4 cloves garlic, peeled and crushed, plus 1 tablespoon minced garlic
1 medium-large onion, chopped
2 carrots, peeled and cut into chunks
2 cups cored and chopped tomatoes, with their juice (canned are fine)
3 or 4 sprigs fresh thyme or 1/2 teaspoon dried thyme
2 bay leaves
¼ pound slab bacon or salt pork, in 1 piece
4 hot Italian sausages, about 3/4 pound
1 pound boneless pork shoulder
2 duck legs
Chicken, beef or vegetable stock, or water, or a mixture, as needed
Salt and freshly ground black pepper to taste
Combine beans, crushed garlic, onion, carrots, tomatoes, thyme, bay leaves and meats in a slow cooker, and turn heat to high. (If you like, brown sausage and duck legs in a skillet before adding.) Add stock or water to cover by 2 inches. Cover and cook until beans and meats are tender, 5 to 6 hours on high heat, 7 hours or more on low.
I forgot to do all of this: When done, add salt and pepper to taste, along with minced garlic. If you like, remove cassoulet from slow cooker, and place in a deep casserole; cover with bread crumbs and roast at 400 degrees until bread crumbs brown, about 15 minutes. Garnish and serve.