The reason for washing quinoa before cooking is to rinse off the saponins, which are a slightly soapy tasting phytochemical. Not at harmful (in fact they are an antioxidant), but they can contribute a slightly bitter flavor.

The reason for washing quinoa before cooking is to rinse off the saponins, which are a slightly soapy tasting phytochemical. Not at harmful (in fact they are an antioxidant), but they can contribute a slightly bitter flavor.