Combine all the spices and pat into the tri tip. Place tri tip in a zip lock bag and add 1 tbsp olive oil. Marinate meat for at least a few hours (preferably overnight).
Preheat a barbecue and sear meat on direct heat for about 8-10 minutes on each side and then on indirect heat for another 10-15 minutes per side or until the internal temperature reaches 130-135 degrees. Let the tri tip rest for at least 15 minutes before cutting slices against the grain.