Prime Rib and Oven-Roasted Potatoes with Bay Leaves and Sage

dried bay leaves, crumbled, plus whole leaves for garnish

coarsely chopped fresh sage leaves, plus whole leaves for garnish

extra-virgin olive oil

Coarse salt

finely grated orange zest, (from 3 oranges)

Freshly ground pepper

(about 7 pounds) three-rib prime rib of beef, trimmed and frenched

russet potatoes, peeled and halved lengthwise