Cut the baguette into four sections. Slice open the baguette and spread some of the cranberry and mustard mix onto the bottom. Add two slices of roast beef, some tomato slices, rocket leaves and red onion. Dollop on some extra cranberry sauce or mayonnaise, if desired.
1 baguette, 2 tbsp cranberry sauce, 1 tbsp dijon mustard, 8 slices roast beef, 2 tomatoes, 0.5 red onion, handful rocket leaves, 1 tbsp mayonnaise