Cook pasta according to package directions; drain well. In a medium skillet cook lamb or beef until meat is brown. Drain off fat. In a medium mixing bowl combine cooked meat, spaghetti sauce, cinnamon, and fennel seed. Set aside.
Meanwhile, in a medium saucepan combine white sauce mix and milk. Cook and stir until thickened and bubbly. Remove from heat. Gradually stir half of the sauce into eggs; return all to saucepan. Stir in feta cheese and nutmeg.
To assemble, layer half of the pasta in a lightly greased 2-quart square baking dish. Spread meat mixture over pasta; top with remaining pasta. Evenly spread the white sauce mixture on top. Sprinkle with kasseri or Parmesan cheese. Bake, uncovered, in a 350 degree F. oven about 35 minutes or until set. Let stand for 10 minutes. To serve, cut into squares. Garnish servings with olives and fresh marjoram, if desired. Makes 6 servings.