For a richer flavor, consider using a combination of mushroom varieties such as shiitake or oyster mushrooms. Dry sherry can be substituted with dry marsala wine for a similar depth of flavor. Adjust the amount of beef broth to achieve your preferred stew consistency. Fresh thyme can be used in place of dried thyme. Use about 1 teaspoon of fresh thyme. Serve immediately after garnishing to enjoy the freshness of the parsley.