Creating Filipino Chicken Barbecue can be straightforward if you follow these simple steps:

1. Prepare the Chicken: Clean and pat dry the chicken pieces. If using whole thighs, you may want to cut them into smaller pieces for even cooking.
2. Make the Marinade: In a mixing bowl, combine soy sauce, vinegar, ketchup, brown sugar, minced garlic, black pepper, calamansi juice, and vegetable oil. Whisk until well blended.
3. Marinate the Chicken: Place the chicken in the marinade, ensuring it is fully coated. Cover and refrigerate for at least 1 hour, but overnight is preferable for deeper flavor.
4. Soak the Skewers: If using bamboo skewers, soak them in water for about 30 minutes to prevent burning during grilling.
5. Preheat the Grill: Heat your grill to medium-high heat. Ensure the grates are clean and lightly oiled.
6. Skewer the Chicken: Remove the chicken from the marinade, letting excess marinade drip off. Thread the chicken pieces onto the soaked skewers.
7. Grill the Chicken: Place the skewers on the preheated grill. Cook for about 10-15 minutes on each side, turning occasionally, until the chicken is charred and cooked through.
8. Check for Doneness: Ensure the internal temperature of the chicken reaches 165°F (75°C). You can also cut into a piece to check that the juices run clear.
9. Baste (Optional): If desired, you can baste the chicken with leftover marinade during the last few minutes of grilling for added flavor.
10. Rest the Chicken: Once cooked, remove the skewers from the grill and let the chicken rest for a few minutes before serving.

These steps will guide you in creating this incredible dish effortlessly.