In a pan over medium heat, combine pork and enough water to cover. Add 1 teaspoon salt, bay leaves, and peppercorns. Bring to a boil,, skimming scum that floats on top.
Lower heat, cover, and cook for about 40 to 50 minutes or until meat is tender.
Drain pork, transfer to a prepared dish, and season with salt.
Refrigerate, uncovered, overnight to cool completely.
Cut into serving pieces.
In a pan over medium heat, add 2 inches deep of canola oil. Heat oil to 350°F. Add pork and cook, turning as needed, until golden and crispy.
Remove from pan, drain on a wire rack, and keep warm.
In another pan, add 2 tablespoons canola oil. Add onions and garlic. Cook until softened.
Add 1 1/2 cups of water and black bean paste. Stir to combine.
Add fermented black beans, chicken base powder, and sugar. Stir to combine.
In a small bowl, add 1 tablespoon of water, and cornstarch. Stir until smooth.
Add slurry to the pan whisking vigorously to prevent lumps. Continue to cook until sauce is thickened.
To serve, arrange fried pork belly on a serving platter. Pour sauce on top and garnish with chopped onions.