6 (8-ounce) buffalo flank or chuck steaks, cut 1/2-inch thick
1/2 cup brown mustard
2 portobello mushrooms, sliced
2 medium green peppers, sliced
2 medium red peppers, sliced
8 strips thick-cut bacon
Your favorite blended seasonings
1 medium onion, chopped
1 1/2 cup beef broth, heated
4 tablespoons all-purpose flour