If you happen to have leftovers, I prefer to reheat in the microwave. First stir in a splash of cream or milk then microwave on high for a minute. Stir and then heat for another 30 seconds - one minute. Stir again. To reheat on the stove top, place leftover tortellini in a small saucepan, add a little cream or milk and heat gently over medium heat. Stir regularly until heated through, about 3-5 minutes.