Start by gathering your ingredients: 500g pork belly cut into small cubes, 500g cleaned and chopped pork innards, 4 cups fresh pork blood, half cup white vinegar, one whole garlic bulb minced, 2 medium onions finely chopped, 2 thumbs ginger minced, 4 bay leaves, 3-4 Thai chilies, 2 tablespoons black peppercorns, salt, pepper, and 1 tablespoon brown sugar.
Before cooking, strain the fresh pork blood twice through a fine mesh strainer. Mix it with the vinegar and a teaspoon of salt. Set this mixture aside at room temperature.
Heat 2 tablespoons of cooking oil in a large, heavy pot over medium heat. Add the minced garlic and cook until it turns light golden. Add the chopped onions and ginger, then cook until they become soft and fragrant.
Add the cubed pork belly first. Cook until the pieces turn lightly brown, about 5-7 minutes. Add the chopped innards and cook for another 5 minutes. Toss in the bay leaves and peppercorns.
Now comes the important part. Pour your blood-vinegar mixture into the pot slowly while stirring gently. Once all the blood is in, stop stirring and let it sit untouched for 5 minutes. This prevents the blood from curdling.
After 5 minutes, bring everything to a gentle simmer and add the whole Thai chilies. Reduce the heat to low and let it cook for 45-50 minutes. Stir occasionally in one direction to keep the sauce smooth.
When the sauce has thickened and the meat is tender, add the brown sugar and stir until dissolved. Taste and adjust the seasoning with salt and pepper until you're happy with the flavor.
Turn off the heat and let the dinuguan rest for 30 minutes. This helps the flavors come together and gives you the signature Goldilocks smoothness.
Serve your dinuguan hot with fresh white puto on the side. Store any leftovers in an airtight container in the refrigerator for up to 3 days. When reheating, do it slowly over low heat, adding a splash of water if needed to maintain the right consistency.