With this product, it's vital to allow the flavor to "bloom". Mix your wasabi paste with very cold water. Cover the container with plastic wrap or a lid and refrigerate while the flavor develops. Allow it to develop for at least 15 minutes after mixing with water. Heat and flavor will continue to develop when refrigerated and covered. Test the paste and if more heat is desired allow it to continue to sit covered and refrigerated for up to a full day. Once the paste is in contact with the air the heat will dissipate, so it is best served in small portions after being freshly made and allowed to bloom. Freeze any unused powder to maintain optimal freshness.