Bisto Onion Gravy Granules to your casseroles, stews and stir fries for a classic, hearty taste that has been favored in the UK since 1979. Britain's best-selling gravy is a quick, convenient choice for weeknight meals of all kinds - just add boiling water to the granules and get the family ready for a delicious treat. Stir it into dishes while they're cooking, or serve up a healthy portion in a gravy boat on the side.