In a nonreactive bowl, stir together harissa, vinegar, salt, pepper, 1/4 cup of the olive oil, and garlic until well blended. Rub marinade all over tri-tip, coating it well. Place tri-tip in a nonreactive dish and cover with plastic wrap or put the roast in a large resealable plastic bag. Allow to marinate in the refrigerator 8 to 12 hours.
Heat the oven to 375°F and arrange a rack in the middle. Remove tri-tip from the refrigerator and let sit at room temperature for 30 minutes.
Heat remaining 1 tablespoon olive oil in a large ovenproof frying pan over medium-high heat. Sear tri-tip for about 2 minutes per side or until nicely browned. Place the frying pan in the oven and roast tri-tip until it reaches an internal temperature of 125°F for medium rare, about 20 to 22 minutes.
Remove tri-tip from the oven and cover loosely with foil. Let rest 15 minutes before carving. Slice across the grain and serve.
Beverage pairing: Massena Moonlight Run GSM, Barossa Valley, Australia. A lushly fruited red with a good dose of aromatic spice is a solid match with the tri-tip. Wines like this can be found in Australia’s Barossa Valley. GSM stands for the blend of Grenache, Syrah, and Mourvèdre grapes.
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