Lasagna Bolognese

Source: Asbury Park Press

For the Bolognese sauce
6 tablespoons unsalted butter
6 tablespoons extra-virgin olive oil
1 pound ground beef
4 ounces prosciutto (se Note No. 2 below)
4 ounces pancetta
2 celery stalked, trimmed and chopped
2 large carrots, peeled, trimmed and chopped
2 onions, peeled, trimmed and chopped
2 to 3 tablespoons tomato paste, diluted in a little water
1/2 cup tomato puree
4 cups dry red wine
Salt and freshly ground black pepper

For the white sauce (besciamella)
1/2 cup unsalted butter
1/2 cup all-purpose flour
4 cups light cream, heated
Salt and freshly ground black pepper
Freshly grated nutmeg
Unsalted butter for baking dish
2 to 3 cups grated Parmigiano-Reggiano cheese
About 1 pound cooked and drained lasagna noodles

To make the Bolognese sauce, melt the butter with the olive oil in a large saut