A show-stopping roast that combines tender prime rib with bold flavors of Dijon mustard, horseradish, and aromatic rosemary. Perfect for special occasions!
Ingredients
2 white onions, cut into 1-inch (2.5 cm) slices
¼ cup Dijon mustard
1 prime rib (about 6 lbs / 2.7 kg)
1½ cups kosher salt
⅓ cup prepared horseradish
2 tablespoons mustard seeds
Optional: fresh rosemary sprigs for extra aroma
Instructions
