It originated as a thin soy sauce made from fermented fish most likely from a region called Tonkin, or in what we call Vietnam today. It was common throughout Southeast Asia in the 17th century.
Tip into a bowl and set aside. To make the tartare sauce, mix all the ingredients together in a bowl and season with a little salt and pepper to taste. For the fish, turn the oven to the grill ...
Flounder looks best when its white stomach side faces ... Decide how far you wish to reduce the sauce, so it is runny or thick. Pour sauce on fish and top with fine strips of yuzu zest.