Sensational Sirloin Kabobs

I've made 3 different marinated kabobs this summer and this one was by far the best! I used zucchini instead of tomatoes which was so yummy! TIP: my mom taught me to soak the skewers in water for at least 30 min and they wont burn and break!
1/4 cup soy sauce
3 TBS light brown sugar
3 TBS distilled white vinegar
1/2 tsp garlic powder
1/2 tsp seasoned salt
1/2 tsp garlic pepper seasoning
4 fluid oz Sprite (or any lemon-lime carbonated drink)
2 lbs beef sirloin
2 green peppers (I like red and yellow instead) cut into 1 inch chunks
1/2 lbs fresh mushrooms, stems removed
1 pint cherry tomatoes
1 fresh pinapple, peeled, cored cubed
skewers
-In a medium bowl, mix soy sauce, brown sugar, distilled white vinegar, garlic powder, seasoned salt, garlic pepper seasoning and Sprite. Reserve about 1/2 cup of marinade for basting. Place beef in a large resealable plastic bag. Cover with marinade and seal shut. Refridgerate 8 hours or overnight.
-Boil a pan of water. Add peppers and cook just 1 min to blanch. Set aside.
-Preheat grill for high heat. Thread beef, veggies and pinapple on skewers. Discard marinade and bag.
-Lightly oil the grill grate. Cook kabobs for 1o minutes or until desired doneness. Baste frequently during the last 5 minutes with reserved marinade.
Enjoy!!