Prepare the Marinade: In a large mixing bowl, whisk together brown sugar, soy sauce, pineapple juice, water, vegetable oil, and minced garlic until well combined.

Marinate the Beef: Slice the round steak into 1/4-inch strips. Place the beef in the marinade and let it marinate in the refrigerator for at least 4 hours.

Prep the Kabobs: Remove the steak from the fridge and let it sit at room temperature for 15 minutes. Soak skewers in water, then thread the beef and vegetables onto the skewers.

Preheat the Grill: Preheat grill to medium-high heat (around 400°F) and lightly oil the grill grate.

Grill the Kabobs: Place the skewers on the grill and cook for 3-4 minutes per side until desired doneness is achieved.

Rest and Serve: Remove kabobs from the grill and let them rest for 5 minutes before serving with coconut rice or stir-fried vegetables.