What to do with leftoversStore in a covered container in the refrigerator for up to 4 days. Reheat to piping hot!Substitutions/AdditionsYou can use any type of ravioli, with any filling you like. They don't even have to be square! The round ones are awesome. Just layer them the same way as the squares.Ground beef can be used in place of sausage, and you can use up to 1lb of meat in the sauce with no other changes.Fresh mozzarella can be used in between the layers for a thick, gooey cheesy center.Can you bake fresh ravioli without boiling? Absolutely! The sauce with the added water will cook them right up for you.What goes with ravioli for dinner?I love garlic knots, an arugula salad or some steamed vegetables.