Step 5: Season Liberally Season the tenderloin liberally on all sides with salt and pepper It is ready to roast HORSERADISH CREAM SAUCE Just as with steaks, you can make easy pan sauces to go with roast beef by deglazing the juices left in the roasting pan However, I prefer to serve mine with a cooling horseradish cream sauce I love the richness it adds and the mustardy bite of the horseradish (who doesn’t like mustard with beef?) Make it with homemade crème frche, and it’ll really knock your socks off ... with roast beef by deglazing the juices left in the roasting pan However, I prefer to serve mine with a cooling horseradish cream sauce I love the richness it adds and the mustardy bite of the horseradish (who doesn’t... richness it adds and the mustardy bite of the horseradish (who doesn’t like mustard with beef ?) Make it with homemade crème frche, and it’ll really knock your socks off