Open-Face Steak Sandwich with Mushroom Sauce

1 pound beef round tip (sandwich) steak or
    sirloin tip steak sliced thin 1/8- to 1/4-inch thick
Salt and pepper
1 teaspoon dried thyme
1 tablespoon olive or vegetable oil
2 cloves garlic, minced
1/2 pound sliced shiitake mushrooms, stems removed
    or sliced white domestic mushrooms
1/4 cup dry red wine
1/2 cup prepared beef gravy
1/2 loaf French bread, split and toasted

Sprinkle meat with salt and pepper and 1/2 of the thyme. Saut