- 2 to 3 large leeks, white and a small part of the light green
- 1 to 2 tablespoons butter or olive oil
- 1/3 cup water or broth
- 1 pound penne pasta
- 3 tablespoons butter
- 4 tablespoons flour
- 3 1/4 cups whole milk
- 12 ounces sharp Cheddar cheese, shredded
- 8 ounces fontina cheese, shredded
- 1 1/2 tablespoons grainy spicy mustard
- 2 large egg yolks
- salt and pepper, to taste
- 1 cup soft bread crumbs
- 2 tablespoons melted butter
- 1 tablespoon chopped parsley or about 1 teaspoon dried parsley flakes
Meanwhile, cook penne pasta in boiling salted water following package directions. Drain well and set aside. Heat oven to 350°. Grease a 4-quart baking dish.
Remove the cooked leeks to a plate and set aside. To the saucepan add 3 tablespoons of butter and melt over medium-low heat. Add the flour and stir until well blended. Stir in leeks and milk. Continue cooking, stirring, until thickened. Add the cheeses and mustard; bring to a simmer, stirring constantly. In a small bowl, whisk egg yolks. Whisk in about 1/2 cup of the hot cheese mixture, then stir the egg mixture into the remaining cheese sauce mixture in the saucepan. Bring to a gentle boil, stirring constantly.
Taste and season with salt and pepper, as desired. Stir in the drained pasta. Transfer the pasta and sauce to the baking dish.
Toss the bread crumbs with 2 tablespoons of melted butter and parsley. Sprinkle over the penne mixture then sprinkle lightly with paprika.
Bake for 25 to 30 minutes, until browned and bubbly.
Serves 6 to 8.
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