01 -
Whisk together lemon juice, olive oil, brown sugar, soy sauce, Worcestershire sauce, garlic, chili powder, kosher salt, and ground black pepper in a small bowl.
02 -
Place the tri-tip roast in a large resealable bag. Pour in the marinade, seal tightly while removing excess air, and refrigerate for 6-8 hours or overnight for optimal flavor.
03 -
In a medium bowl, combine sliced peppers and onions with olive oil, kosher salt, and black pepper. Toss until evenly coated and set aside.
04 -
Preheat a gas or charcoal grill to medium-high heat. Remove the tri-tip from the marinade and grill directly over coals for 5-6 minutes per side for a good sear. Move the tri-tip to indirect heat, cover, and continue cooking for 25-30 minutes. Use a digital meat thermometer to check doneness: 120°F for rare, 130°F for medium-rare, and 140°F for medium.
05 -
Heat olive oil in a skillet over medium-high heat. Add onions and peppers, sautéing for 10 minutes or until softened to your preference. Alternatively, use a cast-iron skillet directly on the grill for cooking.
06 -
Allow the grilled tri-tip to rest for 10-15 minutes. Slice thinly against the grain, adjusting for the changing grain halfway through the cut.