This traditional French sandwich is topped with a classic Mornay sauce (a béchamel sauce with cheese).
Ingredients
6 SERVINGS
Mornay sauce
- 1 1/2 tablespoons butter
- 1 1/2 tablespoons all purpose flour
- 1 1/2 cups whole milk
- 1 bay leaf
- 1/2 cup finely grated Parmesan cheese
- Pinch of freshly grated nutmeg
- Hot pepper sauce
Sandwiches
- 1 8-ounce package crimini (baby bella) or button mushrooms, trimmed
- 7 tablespoons butter, room temperature, divided
- 2 tablespoons minced shallot
- 12 1/3-inch-thick slices egg bread
- 6 thin ham slices
- 12 ounces Gruyère cheese; 9 ounces thinly sliced, 3 ounces grated
- 2 tablespoons grated Parmesan cheese
- Fresh tarragon leaves (optional)
Preparation
Mornay sauce
- Melt butter in heavy medium saucepan over medium heat. Add flour; stir until pale golden, about 2 minutes. Whisk in milk. Add bay leaf. Increase heat to medium-high; whisk until mixture begins to boil. Reduce heat to medium; stir until sauce coats back of spoon, about 5 minutes. Remove from heat. Add cheese and nutmeg. Season with hot sauce, salt, and pepper.
Sandwiches
- Place mushrooms in processor. Using on/off turns, process until finely chopped. Melt 3 tablespoons butter in large skillet over medium-high heat. Add mushrooms and shallot; stir until mushrooms are browned and dry, about 8 minutes. Transfer to plate to cool.
- Preheat broiler. Spread remaining butter over 1 side of bread slices. Place bread, buttered side up, on rimmed baking sheet. Broil until golden, watching closely and rotating sheet halfway through broiling, about 3 minutes. Cool bread. Preheat oven to 450°F. Turn 6 bread slices over; top with ham and sliced cheese. Top with remaining bread slices, broiled side up. Press to compress. Spread about 2 tablespoons sauce over sandwiches, leaving 1/3-inch plain border. Divide mushroom mixture atop sauce. Sprinkle with grated Gruyère and Parmesan.
- Bake sandwiches until cheese inside melts and cheese on top turns golden, about 10 minutes. Top with tarragon, if desired.
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