Thai noodles with peanuts and seafood. In Thailand, sugar and vinegar are seasonings on the table like salt and pepper. This dish would not be preseasoned in Thailand - however, most US restaurants serve it that way, but feel free to work with the sugar and vinegar to taste. The fish sauce is a must - if you do not like fish sauce, you don't like Pad Thai. This recipe is originally from William Crawford and Kamolmal Pootaraka's Thai Home Cooking: From Kamolamal's Kitchen.