Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   butter
   1      medium        onion -- finely chopped
   1      small         green onion -- minced
   1                    celery stalk -- finely chopped
   1                    carrot -- finely chopped
   2      teaspoons     salt
                        a little pepper
 750      gram          ground beef
   2      medium        tomatoes -- chopped
   2                    egg whites
     1/2  kilogram      #1 or #2 macaroni or pennaki
   2      tablespoons   unsalted butter
   2      cups          grated cheese
                        ***béchamel sauce***
   3      tablespoons   butter
     3/4  cup           flour
   1      kilogram      milk
                        salt and pepper
   2                    egg yolks

Preparation:

Sauté the onion, green onion, celery and carrot in the butter until tender. Add the salt, pepper, ground beef and a few spoons of water. Sauté a few minutes and add the tomatoes. Leave the meat with the sauce to simmer for 1/2 an hour. Remove from the heat and add the lightly beaten egg whites. Boil 4 kilos water with a tablespoon salt. Put in the macaroni and leave it to boil for 10 minutes. Add one cup cold water and then drain the macaroni. While macaroni is cooking, prepare the Béchamel Sauce: Put the 3 tablespoons butter and the flour into a saucepan. Stir over slow fire until smooth. Add the milk, gradually, whisking with a wire whisk or electric mixer. Continue cooking until sauce thickens. Remove from the fire and add salt and pepper to taste (optionally, grated nutmeg is also good). Lightly beat the egg yolks, then add a few spoonfuls of the hot sauce to them, and mix well. Then add the egg yolks to the rest of the Béchamel sauce, mixing them in well. Set aside. Put the unsalted butter into the macaroni and then put half the macaroni into a rectangular baking pan. Sprinkle with plenty of grated cheese and then cover with the meat. Put the remaining macaroni on top and cover with cheese. Pour the Béchamel Sauce over. Bake for about 40 minutes in a medium oven. Cut into squares when slightly cooled and serve. Source: Misko Ltd. Athens Greece -- Translation by: Karen Mintzias