First, gather all your ingredients and kitchen tools. You'll need a large bowl for marinating and a wide pan or kawali for cooking.
In a bowl, combine ¼ cup calamansi juice, ¼ cup soy sauce, 4 cloves minced garlic, and ½ teaspoon crushed black peppercorns. Add your chicken pieces and massage the marinade into the meat. Cover and let it marinate in the refrigerator for 30-60 minutes.
After marinating, remove the chicken from the marinade but don't throw the liquid away - save it along with the garlic and spices. Pat the chicken pieces dry with paper towels.
Heat 1 tablespoon oil in your pan over medium heat. Once hot, add the chicken pieces and the reserved garlic from the marinade. Cook until the chicken turns golden brown on all sides, about 5-7 minutes per side.
Pour the reserved marinade and 1 cup of water into the pan. Let it come to a boil, then lower the heat, cover the pan, and let it simmer for 20-25 minutes or until the chicken is tender.
Add 2 tablespoons of liver spread to the pan and stir until it completely dissolves into the sauce. Let it simmer uncovered for another 3-5 minutes until the sauce thickens nicely. Taste and add salt if needed.
Turn off the heat and let the dish rest for 5 minutes. Transfer to a serving dish, garnish with fresh onion rings, and serve hot with steamed rice. For extra flavor, serve with calamansi halves on the side.
Remember: Don't marinate longer than 1 hour as the acid in calamansi can make the meat too soft, and always make sure your chicken is cooked through before serving.