For this recipe, we used precooked chicken and turkey sausages, but just about any kind of sausage -- precooked or not -- can be used in this dish. You can substitute the dried cannellini beans with canned ones (use three 15 1/2-ounce cans). Rinse and drain the beans; then begin with step three. Truffle oil, which has a garlicky aroma and earthy taste, complements all of these ingredients. Look for it at specialty-food stores.