Calzone

Ingredients

• ["1 pizza dough recipe, recipe follows", "Flour, for dusting", "Olive oil", "1 pound mixed mushrooms (such as chanterelles, shiitake, enoki and cremini), cleaned and torn up", "4 cloves garlic, peeled and finely sliced", "4 sprigs fresh thyme, leaves picked", "1/4 cup butter", "Sea salt and freshly ground black pepper", "1 cup tomato sauce", "11 ounces spinach leaves, washed and spun dry", "2 (4-ounce) balls good-quality mozzarella, torn into pieces", "7 cups strong white bread flour or Tipo \"00\"" flour or 5 cups strong white bread flour or Tipo \""00\"" flour