Heat the 2 tablespoons of butter in a saucepan over moderate heat. Add the flour and mustard and cook, stirring until smooth, about 1 minute. Add the milk and cook over moderately low heat ...

Crush 2 cups (about 1 bag) of the potato chips into 1/2-inch pieces; add to lettuce mixture. Stir in cheese and mix until combined. Top with remaining whole potato chips and more grated cheese.

He then adds American cheese, beefsteak tomato, lettuce, red onion, a homemade horseradish mustard mayonnaise sauce, and potato chips for the perfect amount of crunch. Gordon Ramsay says seasoning ...