Mix black pepper, crushed coriander seeds, paprika, garlic powder, and salt.
Rub the roast all over with olive oil, then press the spice mixture firmly onto every surface.
Refrigerate uncovered at least 2 hours, or ideally overnight, to let the crust set.
Preheat oven to 300°F (150°C).
Place the roast on a rack in a roasting pan and cook 1 hour 45 minutes to 2 hours, until a thermometer reads 195°F (90°C) for a tender, sliceable result.
Rest 15 minutes, then slice thin against the grain.