The best french fries you will ever eat in your life are twice cooked puffed fries, called pommes soufflee. They are incredibly tricky to prepare, though I watched Paul Bocuse cook them, and he made it look like child's play, natch.

When served, the fries have "puffed" to 4 times their original size, becoming light, airy little pillows of potato heaven.

Here's a link to the recipe and back-story:

http://www.foodreference.com/html/pom-souf-21507.html