Preheat the oven to 375°F (190°C)
Pat the pork sirloin roast dry
Season all sides with salt, pepper, and desired spices
Heat oil in a skillet over medium-high heat
Sear the roast on all sides until browned
Place the roast in a roasting pan or oven-safe dish
Insert a meat thermometer into the thickest part
Roast until the internal temperature reaches 145°F (63°C)
Remove from the oven
Rest the roast for 10 to 15 minutes
Slice against the grain
Serve immediately