1) Fill a large mixing bowl with cold water
2) Slice the artichoke stalks into 4 cm pieces then cut the artichokes in quarters, removing any fuzzy parts. Immediately submerge the artichokes into the cold water to prevent it from going black
3) In a large pot, add pork ribs, artichokes, fish sauce, sugar, salt, pepper and 2.5 litres water. Bring to a boil then skim off any impurities for 10 minutes.
4) Reduce the heat to a low simmer then close with lid. Simmer for 45 minutes.
Always use a stainless-steel knife and submerge sliced artichokes in water to prevent the artichoke turning black.