Step 1

Preheat the oven to 300 degrees F (150 degrees C).

Step 2

Warm the au jus sauce in a saucepan over medium heat. Add the roast beef and let it warm up at the same time. While the meat is soaking, place the rolls on a baking sheet with the cut side down. Brush the tops lightly with water and sprinkle with salt and caraway seeds.

Step 3

Bake in the preheated oven until rolls are toasted, about 10 minutes. Serve the sliced beef on the rolls with the au jus and horseradish on the side.