Filet Mignon with Mushroom Cabernet Sauce

Bahan-bahan (2 porsi)

• 1 teaspoon butter
• 2 tablespoons finely chopped shallots
• ¼ pound (4 ounces) shiitake mushrooms, (stems removed)
• ½ cup Cabernet Sauvignon
• ⅓ cup beef broth
• Two 4-ounce filet mignon steaks ((about 1-inch-thick))
• ¼ teaspoon freshly ground black pepper
• 1 teaspoon butter
• ½ tablespoon low-sodium soy sauce
• 1 teaspoon cornstarch
• ¼ cup Cabernet Sauvignon
• ½ cup beef broth
• ½ teaspoon dried thyme
• fresh thyme sprigs, (for garnish (optional))