3 cups prepared au jus sauce2 pounds thinly sliced roast beef6 Kaiser rolls, split2 teaspoons kosher salt2 teaspoons caraway seeds1/4 cup prepared horseradish
Preheat the oven to 300 degrees F (150 degrees C). 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. 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.