1Combine mayonnaise, sour cream, 1/2 cup cilantro, green onions, 1 1/2 tablespoon ground chipotle peppers, 1 tablespoon lime juice, garlic basil spread, 1 teaspoon cumin, salt, and black pepper in a bowl. Stir until combined. Cover and refrigerate chipotle mayonnaise for at least 1 hour.
2Combine beef tri-tip, Anaheim chile peppers, onion, red bell pepper, green bell pepper, juice of 1 lime, olive oil, garlic, red pepper flakes, 1 teaspoon cumin, 1 teaspoon ground chipotle pepper, smoked paprika, and Mexican oregano in a large bowl; season with salt and black pepper and toss to combine. Cover and refrigerate beef mixture for at least 4 hours.
