The basic zucchini sauce for this pasta can be reheated in the microwave, however, in a pan will give the best results. If you are cooking fresh pasta to add to the premade sauce, add a tablespoon or two of pasta cooking water to the zucchini and warm-up on medium heat until piping hot. If the whole meal is ready and needs reheating, put the pasta in a pan with a spoon of water and mix it well, then put a lid on the pan; warm up the zucchini pasta on a low-medium flame, so that the steam from the evaporating water heats up the pasta. This should take 4-5 minutes, but ensure you keep stirring occasionally so as to ensure it doesn't dry up or stick to the bottom of the pan.