Rosemary-Prime-Dijon-Rib

*Rosemary-Prime-Dijon-Rib

*Ingredients
2 white onions, cut to 1-inch (2.5 cm) slice
¼ c Dijon mustard
1 prime rib (about 6 lbs/2.7 kg)
1 1/2 cups (375 ml) kosher salt
⅓ c ( 75 mL ) prepared horseradish
2 tbsp. 2 tbsp (30 ml) mustard seeds
2 tbsp. 2 tbsp (30 ml) fresh thyme
2 tbsp. 2 tbsp (30 ml) fresh rosemary
2 tbsp. 2 tbsp (30 ml) ground black pepper
5 bay leaves, crumbled
3 egg white
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