Grilled Filipino pork skewers

Ingredients

• 18 wooden skewers
• 1/3 cup lemon-lime soda , 7Up or Sprite
• 1/3 cup soy sauce
• 1/3 cup brown sugar
• 3 tbsp white vinegar
• 2 tsp sesame oil
• 1 tsp garlic powder
• 1 tsp pepper
• 1 tsp hot-red-chili-flakes
• 750 g pork shoulder , cut into 3-in.-long strips about 1/4 in. thick

Sauce

• 1/2 cup white vinegar
• 2 garlic cloves , minced
• 1 large chili pepper , chopped
• 1/2 tsp salt