Take your tri-tip and trim off any silver skin you find. Be sure not to cut too deep. Combine salt, black pepper, granulated garlic, granulated onion, paprika, rosemary, and cayenne. This will make about 1/3 cup of rub.
Use about half of this mixture to rub into the tri-tip on all sides. Reserve the other half to reseason a few times during the cooking process. Place in a dish, cover and refrigerate for at least an hour.
Whisk the vinegar, vegetable oil, crushed garlic, and Dijon mustard together and set aside.
Preheat your Grilla, Silverbac, or Kong for high-temp grilling—300 degrees is fine.
Remove the beef from the refrigerator and go straight to the grill with it.
Please ensure you have a high-quality thermometer handy in order to ensure you don’t overcook this awesome piece of beef.
Place meat on the Grilla Grill and let it cook for about 15min and then brush with your liquid mixture. Every 15-20min flip and rotate your tri-trip on the grill and baste and reseason.
Repeat this process until the beef firms up and the internal temp is between 130 and 135 degrees. This will be pretty rare so if you want to take to more of a medium allow the meat to reach about 140 degrees. Depending on the size of your tri-tip this process may take an hour and a half to two hours. The thickness of the meat will determine how fast it actually cooks more than its overall weight.
Remove meat from your Grilla and rest for 15 minutes, then slice across the grain and serve. This cut of meat goes fantastic with a balsamic reduction and blue cheese crumbles.