Recipe

Put the fish head in a pot with 7 cups water and bring to a gentle boil over medium heat. Reduce the heat to medium-low and simmer until the liquid is reduced by 1 cup, about 30 minutes. At this time you may discard the fish head if you wish.

Wash the beef bones, place in a large soup pot and add water to cover. Bring to a boil over low heat and immediately pour off this “first boiling” water and discard. Re-boil and skim off any foam to get a clear both.

Mix the sugar and vinegar into a mixing bowl. Melt it over low heat. Add in a little bit of nuoc cham (fish sauce). Add in the burnt caramel sauce into the sauce and set aside.