Ingredients

  • 1/2 stick (1/4 cup) unsalted butter, plus more for greasing dish
  • 1/4 cup all-purpose flour
  • 3 cups milk, warmed
  • 2 eggs
  • 2 tablespoons chopped fresh dill
  • Freshly grated nutmeg, to taste
  • 1 1/4 teaspoons salt
  • 1/2 teaspoon freshly ground black pepper
  • 3/4 pound penne
  • 2 cups chopped leftover pot roast
  • 1/4 cup beef broth
  • 1/2 cup leftover pot roast gravy
  • 1/2 cup grated Kefalotyri or Parmesan, about 2 ounces

Method

  • Preheat oven to 375 degrees F.
  • In a heavy saucepan over medium-low heat, melt butter.
  • Whisk in flour and cook, whisking, 3 minutes.
  • Whisk in milk and bring the sauce to a simmer.
  • Simmer sauce, stirring, about 8 minutes.
  • In a bowl, whisk eggs and add 1 cup sauce in a steady stream, whisking constantly to keep the eggs from cooking.
  • Whisk egg mixture into remaining sauce and stir in dill, nutmeg, and salt and pepper.
  • Keep dill sauce warm and its surface covered with plastic wrap.
  • In a pot of boiling salted water, cook penne until al dente.
  • Rinse penne in colander and drain well.
  • In a large bowl, stir together pot roast meat, beef broth, and gravy.
  • In a buttered shallow 7 by-11-inch baking dish, place half of pasta evenly over the bottom.
  • Top with 1/3 of the reserved sauce and then spread beef mixture evenly on top of the sauce.
  • Top evenly with remaining pasta and pour the remaining sauce over the pasta.
  • (Pour the sauce slowly to keep from overflowing and to allow it to sink in.)
  • Bake in middle of oven until set, about 40 minutes.
  • Sprinkle cheese over the pastitsio during the last 20 minutes of baking.