Crock Pot French Dip Sandwiches. 2-3 lb oven roast 2 cans beef broth (about 4 cups) 2 pkgs Lipton Onion Soup Mix white Italian sub rolls, provolone cheese slices Put oven roast in crock pot. Add beef broth & soup mix. Cook on low 7-8 hours. Shred roast with a fork, and return shredded beef to crock pot for a few more minutes.