Mix the marinade ingredients together in a bowl : minced garlic, soy sauce, calamansi juice (or use lemon), banana catsup (or use tomato catsup), half of the ginger ale, salt, black pepper. Leave ½ cup of the marinade plus the sugar, aside for the grilling glaze. Pour the rest of the marinade over the pork. Keep in a non-reactive container. Cover with plastic wrap and refrigerate the pork overnight.
The next day, pre-soak the bamboo skewers in water for about 20 minutes. Then skewer the pork pieces into each bamboo stick, allowing approximately 6 to 7 pieces on each one.
Pre-heat the outdoor barbecue grill to a medium high heat. Get ready with the grilling glaze set aside from the day before, add the sugar and remaining ginger ale. Grill the barbecued pork, about 12 minutes on each side while rotating the skewers. Total grilling time should take about 30 minutes. Baste the pork barbecue every few minutes so that it gets moist and shiny.
When cooked, serve hot on long platters and garnish with tomatoes, cucumbers and green pickled mangoes or some "achara", green papaya pickle relish.