Sweet Teriyaki Beef Skewers

INGREDIENTS

• 1 1/2 cups light brown sugar
• 1 cup soy sauce
• 1/2 cup pineapple juice (optional)
• 1/2 cup water
• 1/4 cup vegetable oil
• 3 large garlic cloves, chopped
• 4 pounds boneless round steak, cut into 1/4-inch slices
• bamboo skewers, soaked in water