In a bowl, combine the beef broth, onions, Worcestershire, soy sauce, thyme, balsamic vinegar, bouillon, garlic, lemon juice, red wine and some salt and pepper to taste. Stir
Place the shaved steak in a resealable bag; pour the liquid over the beef. Seal the bag and marinate overnight.
Place the beef and marinade in the instant pot when ready to prepare, Set for 10 minutes on high pressure.
In the meantime, wrap the sandwich rolls in some aluminum foil and keep them warm in the oven. Alternatively, you could toast the sandwich rolls in some hot melted butter.
Place the bottom half of a roll on a greased cookie sheet. Place some beef on top of the sandwich roll and top with gruyere cheese. Bake for about 10 minutes until the cheese is melted.
Place the top slice of the roll on top of the sandwich. Serve some of the au jus in a bowl on the side. To eat, dip the sandwich in the au jus and take a bite. French dip sandwiches remind me of po'boys. Nothing but YUM!