Tri-tip can be intimidating to barbecue as it can turn out very tough. The Island Grillstone™ makes it easy to barbecue a tender Tri-Tip, as none of the flavors or juices can fall through the grill grates.

  • AUTHOR: Gary House
  • PREP TIME: 35 mins plus 8-12 hrs marinade time
  • COOK TIME: varies – cook to 145°F
  • TOTAL: ~ 1 hour
  • SERVES: 6-8


  • 3 pounds trimmed tri-tip
  • 1 cup (16 tablespoons) marinade
  • 1 pound potatoes
  • 1 pound mushroom
  • 1 onion
  • 3 tablespoons olive oil
  • Freshly ground black pepper, to taste
  • Garlic salt, to taste
  • Coarse salt, to taste


  1. Place the tri-tip in a ziploc bag.
  2. Pour the marinade on top and let the tri-tip marinate overnight.
  3. Prepare the grill for cooking.
  4. Place mesquite wood in the grill and then place the Island GrillStone on top of a rack.
  5. Preheat the grill to 350 F.
  6. Place the potatoes, mushrooms and garlic in a big bowl.
  7. Drizzle olive oil over the vegetables.
  8. Season with garlic salt, parsley and freshly ground pepper.
  9. Prepare a bed of onions on the Island Grillstone for the tri-tip.
  10. Season with coarse salt.
  11. Place the trip tip over the onions.
  12. Place the potatoes, garlic and mushroom on the Island grill stone.
  13. Cover and let everything cook until it reaches an internal temperature of 145 F.
  14. Remove from heat and let it rest for 10 minutes.
  15. Slice the tri-tip across the grain and serve it with the vegetables.

Things You Need

  • Wireless thermometer
  • Island Grillstone
  • Grill

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