Wrap the entire loaf with waxed paper. Tie with 6 pieces of twine, spacing evenly along loaf. To serve, cut between twine into 6 serving pieces.
If sweet onions are not available, slices of red onion would be equally delicious in these flavor-packed sub sandwiches.
French bread loaves vary in thickness depending on where they're purchased. If your loaf is very thick, pull out some of the soft bread in the center so the sandwich won't stack too high.