Preheat the oven to 425°F
Pat the tri-tip dry with paper towels
Season all sides with salt, pepper, and any desired spices
Heat an oven-safe skillet over medium-high heat
Add a little oil to the skillet
Sear the tri-tip for 2 to 3 minutes per side
Transfer the skillet to the oven
Roast until the internal temperature reaches 130°F to 135°F for medium-rare
Roast until the internal temperature reaches 140°F to 145°F for medium
Remove the tri-tip from the oven
Rest the meat for 10 to 15 minutes
Slice against the grain
Serve immediately