For ravioli, I have seen or eaten some filled with pork, some with beef, some with cheese, some with chicken. Just like making chili, there are many varieties. If you do a search on Yahoo or Google, some ravioli recipes include goat cheese and scallion (green onion), pumpkin, crab and salmon, blueberry, butternut squash, chorizo sausage, spinach and beef, smoked haddock, portabella mushroom, sweet potato, butternut squash, pumpkin pecan, lobster, chestnut, artichoke, ricotta and sun dried tomato, shrimp, tofu, crab rangoon, and many more. And the sauces that go on them are just as varied.