Pistachio-Crusted Prime Rib Roast with Pan Gravy | Savory

Ingredients

• 1 (3 to 4 rib) prime rib roast (approx 7 to 8 lbs), room temperature
• 1/2 cup shelled pistachios, finely chopped
• 2 tbsp chopped fresh thyme, plus more to serve
• 1 tsp ground coriander
• 3 tbsp olive oil, divided
• 1 lb carrots, peeled and cut into 1-inch pieces
• 2 turnips, peeled and cut into 1-inch pieces
• 1 lb Brussels sprouts, trimmed and halved
• 3 cups reduced-sodium beef broth, divided
• 2 tbsp unsalted butter
• 2 tbsp all-purpose flour