1 ounce dried porcini mushrooms or mixed wild mushrooms
2 cups water or chicken stock
2 tablespoons extra-virgin olive oil
3 tablespoons butter, cut into pieces
4 large portabella mushrooms, gills scraped, cut into 1/4-inch dice
1 medium onion, chopped
1 small carrot, peeled and finely chopped or grated
1 small rib celery, finely chopped
3 to 4 large cloves garlic, finely chopped
1 fresh bay leaf
1 (10-ounce) box organic chopped frozen spinach, defrosted and wrung dry in kitchen towel
Salt and freshly ground black pepper
Freshly grated nutmeg, to taste
1/4 cup tomato paste
1 cup dry white wine
1 cup whole milk
1 pound pappardelle or fettuccine pasta
A handful fresh flat-leaf parsley, finely chopped
Grated Pecorino-Romano cheese