Preheat the oven to 325°F
Pat the rump roast dry with paper towels
Season all sides generously with salt, black pepper, and any desired herbs or spices
Heat oil in a large oven-safe skillet or roasting pan over medium-high heat
Sear the roast on all sides until browned
Place the roast fat side up in the pan or on a rack in a roasting pan
Insert a meat thermometer into the thickest part of the roast
Roast in the oven until the desired internal temperature is reached
Remove from the oven and tent loosely with foil
Let the roast rest for 15 to 20 minutes
Slice thinly against the grain
Serve immediately