serves 8
        
        for the balsamella white sauce: 
        (makes approx 6 cups sauce):
        * 4 1/2 oz (125 gr) butter
        * 5 1/2 oz (150 gr) flour
        * 5 1/3 cup (1250 cc) milk
        * salt
        * 2 1/2 oz (75 gr) parmigiano reggiano, freshly grated
        * Pinch of nutmeg
        
        for the filling:
        * 3 - 4 tablespoons butter
        * 2 tablespoons extra-virgin olive oil
        * 2 1/2 lb (1 kg) ground beef, or mix of different ground meats (beef, pork, cold cuts)
        * salt and pepper
        * 3 oz (90 gr) parmigiano reggiano, freshly grated
        * pinch of nutmeg
        
        for the cannelloni:
        * 20 dry no-boil cannelloni (manicotti)
        * 3 oz (90 gr) parmigiano reggiano cheese, freshly grated