Trim off any silver skin and leave the fat cap on for flavor while preparing the meat.
Salt the tri tip and place it on a wire rack in the fridge uncovered overnight.
Let the tri tip sit at room temperature for a bit after taking it out of the fridge.
Apply avocado oil and then coat with MR Meat Rub before smoking.
Preheat the Ninja Woodfire Grill to the smoker setting at 250°F.
Place the tri tip on the grill and smoke for about 2 hours, ensuring the fat cap is facing up.
When the internal temperature reaches about 100°F, switch to the air crisp function at 375°F for 10 minutes to render the fat further.
Remove the tri tip from the grill and let it rest for 10-15 minutes before slicing.
Slice against the grain for tenderness, cutting into half-inch slices.