Thirty minutes before cooking, remove your chicken from the refrigerator to reach room temperature. Preheat your oven to 450°F and put your sizzling plate inside to get very hot.
Prepare all your ingredients first: Finely chop the cooked chicken into small, uniform pieces. Mince the garlic. Dice the onions into small cubes. If using whole chicken liver, cut it into small pieces.
Heat 2 tablespoons oil in a wide pan over medium-high heat. Add minced garlic and cook for 1 minute until it smells good but isn't brown. Add your chopped chicken and spread it out evenly in the pan. Don't stir it for 2-3 minutes – let the bottom get crispy.
Pour in the soy sauce and stir everything well. Cook for another minute until the liquid is gone and the chicken starts to brown. Put this in a large mixing bowl and set aside.
Using the same pan, add another tablespoon of oil and cook the chicken liver over medium heat for about 5-7 minutes until it's cooked through and slightly crispy on the edges. Once it's cool enough to touch, chop it into very small pieces.
Put everything in your mixing bowl – the crispy chicken, chopped liver, and diced onions. Pour in your calamansi juice and add the mayonnaise. Mix everything together until all ingredients are evenly coated. Taste it and add salt and pepper as needed.
Put on your oven mitts and carefully take out the hot sizzling plate. Place it on its wooden base. Quickly transfer your chicken mixture onto the hot plate – you should hear it sizzle right away. Top with chopped Thai chilies.
Serve immediately while it's still sizzling. Mix everything on the hot plate to let the bottom layer get crispy. Serve with extra calamansi on the side and hot rice.
For the best taste, eat it right away while it's hot and still sizzling. Don't forget to squeeze some fresh calamansi juice over your portion right before eating!