For the bechamel sauce: Melt the butter in a small pot. Add the onion and cook over low heat to sweat them. Stir in the flour and cook for 1 to 2 minutes. Slowly stir in the milk and bring to a simmer. Cook until smooth and thickened, 10 to 15 minutes, and then season with salt, pepper and nutmeg, if using.
For the sandwich: Heat the oven to high broil.
Build each sandwich as follows: Spread 1 teaspoon of Dijon mustard on a piece of bread; top with 1 slice of Gruyere, 4 ounces ham, another slice of Gruyere and then a piece of bread. Melt half the butter in a large skillet. Add the sandwiches and toast to a golden brown. Flip and brown on the second side. Remove the sandwiches from the pan and place on a rimmed baking sheet.
Spoon 1/3 cup of the bechamel sauce over the top of each sandwich. Broil the sandwiches to brulee the bechamel.
Meanwhile, melt the remaining 4 tablespoons butter in the skillet and cook the eggs over-easy. Remove the sandwiches from the broiler and top with the over-easy eggs.
Tools You May Need
Tools You May Need
Price and stock may change after publish date, and we may make money off
these links.
By entering your email address, you agree to our Terms of Use
and acknowledge the Privacy Policy.
Food Network and
its affiliates
may use your email address to provide updates, ads, and offers.
To withdraw your consent or learn more about your rights, see the
Privacy Policy.