Empanada de Champiñones : Foodwise

Ingredients

• 1¾ pounds unbleached flour
• 1 tablespoon fine sea salt
• 1 pound unsalted butter, cold
• 1 egg
• 1 tablespoon champagne vinegar
• Ice water
• 3 pounds wild mushrooms, roughly chopped
• 1 stick butter
• ½ cup olive oil
• 4 cups thinly sliced shallots
• Salt and pepper, to taste
• 1 cup dry white wine
• 2 cups vegetable broth
• 2 cups crème fraiche
• 6 cups grated Parmesan cheese