In a medium-sized bowl, mix together the Worcestershire sauce, balsamic vinegar, black pepper, kosher salt, minced garlic, tamari sauce, olive oil, lemon juice, and smoked paprika. Whisk until it’s well combined. This marinade is where the magic begins.

Place the cubed top sirloin into a resealable plastic bag and pour the marinade over it. Seal the bag, and make sure every piece of beef is coated. Let it marinate in the refrigerator for at least an hour, or even overnight for maximum flavor.

While the beef marinates, chop the bell peppers and onion into chunks. Halve the baby bell mushrooms. This part is where you can have fun with color and texture!

Once the beef has marinated, remove it from the refrigerator. Preheat your grill. Thread the beef, bell peppers, onions, and mushrooms onto skewers, alternating as you go. Make sure everything fits snugly but not too tightly.

Place the skewers on the hot grill. Cook them for about 10-15 minutes, turning occasionally. You’ll want that perfect char on the outside while keeping the inside juicy. Use a meat thermometer to ensure the beef reaches an internal temperature of 145°F for medium-rare.

Once done, remove the kebabs from the grill and let them rest for a few minutes. This helps the juices redistribute. Serve them hot with your favorite sides and sauces. Enjoy every single bite!