Simmer the Broth:
Place the cleaned pork bones back in the pot. Add 2 liters of fresh water, the halved onion, smashed garlic cloves, and 200g of shrimp shells (optional for extra flavor).
Bring to a boil, then reduce the heat to low. Simmer for 1-2 hours, skimming off any foam or impurities that rise to the surface to ensure a clear broth.
Strain the Broth: After simmering, strain the broth through a fine mesh sieve into a clean pot, discarding the solids. Return the clear broth to the pot and keep it warm over low heat.