This is where your culinary creativity comes into play. You can be a purist and just go with salt and pepper, allowing the flavors of the beef to shine through. Or, you can take your sous vide roast beef to another level with additional flavors to enhance your meal. Here are some suggestions if you are looking for inspiration: a packet of au jus gravy powder 2 teaspoons garlic powder, 1 tbsp rosemary, minced, 1/2 tbsp Worcestershire sauce, 1 tsp smoked paprika, 1/2 tsp mustard powder, 1/2 tsp onion powder 3/4 cup of dry red wine (Cabernet or Pinot Noir),2 cups of beef broth, 1 tsp of dried thyme, 1 tbsp of Worcestershire sauce, 2 bay leaves