Tossing Cooked Pasta With Oil to Prevent Sticking
Why it’s bad: The sauce won’t adhere to the noodles. Period.
Do this instead: To stop cooked pasta from clumping, toss it with a little sauce immediately after draining. Or, if you won’t be serving the pasta for 15 minutes or more, rinse the noodles under cold water to remove the starch. Then, just before sitting down to eat, reheat the pasta directly in the pot of sauce.