Sous Vide Filet Mignon with Stroganoff Sauce

Ingredients

• ½ ounce dried porcini mushrooms
• 1 ½ tablespoons vegetable oil
• ½ tablespoon unsalted butter
• 2 (6-ounce) filet mignon steaks
• Salt and freshly ground black pepper
• ½ cup chopped onion
• 8 ounces sliced white mushrooms
• 1 clove garlic, minced
• ¼ cup dry sherry
• ½ cup beef stock
• 3 tablespoons sour cream
• 1 teaspoon Worcestershire sauce
• 1 tablespoon vegetable oil