There are two different grains within tri-tip. For maximum tenderness, always slice against the grain. After cooking, cut the tri-tip where the two grains intersect, then thinly slice each piece perpendicular to the grain.
Directions Dry rub seasonings onto tri-tip. Preheat smoker to 180 degrees. Place tri-tip on smoker and smoke for 3 hours. Remove from smoker and rub garlic olive oil over entire roast. Wrap with tinfoil. Increase temperature to 225 and continue to cook