Penne With Leeks, Fontina, and Cheddar

In a large saucepan or Dutch oven, heat 1 to 2 tablespoons butter or olive oil over medium-low heat (enough to cover bottom of the pan). Add the leeks and cook, stirring, for about 2 to 4 minutes, or until wilted. Add the 1/4 cup of broth or water and bring to a simmer. Reduce heat to low, cover, and cook, stirring occasionally, until golden in color, about 45 to 60 minutes.

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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