Beef Wellingtons with Gorgonzola and Madeira Wine Sauce

Bahan-bahan (4 porsi)

• 4 (1½"-thick) center-cut filet mignons ((about 6 ounces each))
• 4 ounces large mushrooms
• 1 tablespoon unsalted butter
• 1 tablespoon finely chopped shallot
• 1 tablespoon minced garlic
• 1 large egg ((whisked with 1 tablespoon water))
• 1 sheet puff pastry, (thawed (see Recipe Notes below))
• 4 tablespoons crumbled Gorgonzola cheese
• 1 teaspoon olive oil
• 2 tablespoons finely chopped shallots
• ½ cup Madeira wine
• ¾ cup beef broth
• salt and freshly ground black pepper
• 3 tablespoons butter, (at room temperature (divided))
• 1 teaspoon all purpose flour
• 2 teaspoons chopped fresh Italian parsley