Ingredients

• One 6-pound sirloin tip roast, preferably grass-fed, tied
• 1/2 cup prepared horseradish
• 2 tablespoons kosher salt
• 2 tablespoons Dijon mustard
• 2 tablespoons finely chopped parsley
• 1 tablespoon coarsely ground black pepper
• 1 tablespoon sugar
• 1 tablespoon sherry vinegar

Directions

1. Preheat the oven to 375°. Set a rack in a large, deep roasting pan and place the beef roast on the rack.

2. In a small bowl, blend the horseradish with the salt, Dijon mustard, chopped parsley, ground pepper, sugar and sherry vinegar to form a paste. Slather the paste all over the top and sides of the meat. Roast in the lower third of the oven for about 2 hours, until an instant-read thermometer inserted in the center of the roast registers 125°. Transfer the roast to a cutting board and let rest for at least 20 minutes.

3. Discard the string and thinly slice the roast beef across the grain. Transfer the meat to a platter and serve.

4. MAKE AHEAD

5. The unsliced roast beef can be refrigerated for up to 3 days. The sliced roast beef can be wrapped in plastic and refrigerated overnight.

6. SERVE WITH

7. Mashed potatoes.

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