Fish sauce enhances the umami, or savory, taste of this dish. The fish sauce that’s sold in grocery stores usually comes from one of three countries: Thailand, Vietnam, or the Philippines. Filipino fish sauce is often the heaviest of the three. Avoid fish sauce that contains sodium benzoate as a preservative, which will leave an unpleasant aftertaste. Finally, be willing to spend a little extra money to get a higher-quality sauce. Your taste buds will thank you!