If you are planning on storing your pasta dish, I recommend undercooking the pasta just a little. This way when reheated your pasta won't be over cooked. Store your pasta dish in the fridge for up to 3 days. It is also freezer friendly; store in the freezer in an airtight container for up to 3 months. To reheat your pasta dish, heat up a few tablespoons of water in a frying pan and warm up your pasta.
The fennel spaghetti would be delicious chopped up and added to a soup recipe. Simply make your soup and add the pasta towards the end to prevent overcooking them.