Pat the tri-tip dry
Trim excess fat if needed
Season generously with salt, pepper, and garlic powder
Let it rest at room temperature for 30 to 45 minutes
Preheat oven to 400°F or grill to medium-high heat
Sear the tri-tip on all sides until browned
Roast in the oven or move to indirect heat on the grill
Cook until the internal temperature reaches 130°F to 135°F for medium-rare
Remove from heat and rest for 10 to 15 minutes
Slice thinly against the grain
Serve immediately