Created by TeresaS on March 5, 2016
Step 1: In an 8 or 9-inch square baking dish, combine sirloin, garlic, rosemary, vinegar, soy sauce, olive oil and 1/2 teaspoon black pepper. Stir gently to coat. Cover and refrigerate for 6 to 24 hours, stirring 2 or 3 times.
Step 2: Thread skewers alternating between sirloin, onion and bell pepper. Sprinkle with salt and remaining 1/4 teaspoon black pepper.
Step 3: Heat a grill on medium-high. Lightly brush grate with cooking oil and transfer skewers to grill. Cook, turning once or twice, until sirloin reaches desired doneness, 9 to 11 minutes for medium-rare to medium or 11 to 13 minutes for medium to medium-well.
Step 4: Transfer to a large plate and let rest for 5 minutes.