My DH and DC's love a good spag bol but as soon as I serve up the spaghetti (the normal type boiled in the normal way with a little salt added to the water.) The bloody stuff sticks together as if glued. I prefer the wholemeal kind myself and it doesn't stick like the 'normal' type. DC's and DH don't like wholemeal though. So, how to stop it sticking? I know you can buy those Knorr cubes that you add to the water (do keep meaning to get some) but are they any good? Any other tips for a stick-free lovely bowl of spaghetti?