For sauce:
1 1/2 cups shitake mushrooms, sliced
1 Tablespoon gf flour
1/3 cup port wine
1/4 cup shallots, minced
1 Tablespoon balsamic vinegar
1 cup
gf beef broth2 teaspoons
gf worchestershire sauce1 teaspoon tomato paste
1/8 teaspoon dried rosemary
1/2 teaspoon gf stone ground mustard
For steak:
4 beef tenderloin steaks
1 Tablespoon black peppercorns, crushed
1/2 teaspoon salt