Step 1

Whisk brown sugar, soy sauce, pineapple juice, water, vegetable oil, and garlic together in a large bowl; drop beef slices into the mixture and stir to coat. Cover bowl with plastic wrap.

Step 2

Marinate beef in refrigerator for 24 hours.

Step 3

Remove beef from the marinade, shaking to remove any excess liquid. Discard marinade.

Step 4

Thread beef slices in a zig-zag onto the skewers.

Step 5

Preheat grill for medium heat and lightly oil the grate.

Step 6

Cook skewers on preheated grill until the beef is cooked through, about 3 minutes per side.