I used to preserve it in jars but now I freeze it in meal size portions. Its a great winter comfort food. Sometimes I add fried meatballs or sausages to make a more substantial spaghetti & the sauce or spaghetti is lovely over fish cakes.
Add 150g broken spaghetti pasta before boiling if you plan to serve immediately. The pasta soaks up the extra liquid so just cook until pasta is al dente (about 10 minutes).
I usually stir through 60g of grated cheese when it has finished cooking... or sprinkle on top once plated up.