I am frequently asked, “How do I eat french fries? With a fork or with my fingers?” This question is very common among my college students who consider french fries a staple vegetable item.
If you are dining in a casual atmosphere and the fries are served with a sandwich or hamburger, you may eat the fries with your fingers. Never, never, never lick your fingers. Use your napkin.
If you are using a fork and knife to eat your entree, cut the french fries into smaller pieces and eat them with your fork.
In either situation, do not pour ketchup directly on the fries. Place the ketchup on your plate and dip the fries in the ketchup.