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In a medium bowl, whisk together olive oil, soy sauce, garlic, and pepper.
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Add the cubed sirloin steak to marinade coating meat completely. Cover with plastic wrap and marinate for 30-60 minutes.
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Prepare the skewers by threading in a patter bell pepper, tomato, red onion, sirloin.
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Grill kebabs over medium heat, turning often, until all sides of the meat is well brown and vegetables are tender, about 10- 15 minutes.
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Serve and enjoy!