Pad Thai Sauce is prepared with 3 ingredients only: Tamarind paste, palm sugar, and fish sauce. The ratio is 1:1:1, which makes it easier for you to prepare this sauce in bigger or smaller quantities. You just need to make sure that all the ingredients are perfectly balanced. For example, when you use commercially available tamarind paste which is more compressed, the pad thai sauce can turn a tad sourer. In that case, you will need to adjust the sauce by adding a little more palm sugar and/or fish sauce. So make sure to taste test your sauce before bottling it up.