Brupaks Brewer's Choice are are unique in that they are the first dried ingredient kits that don't require boiling. The kits are comprised of first-grade, spray-dried malt extract, freshly crushed grains, pre isomerised hop pellets and genuine brewer's yeast. As the hops have already been isomerised (alpha acids, the bittering substances in hops, are insoluble until they have been boiled in wort for at least 20 minutes) all that is neccessary to release their biterness and flavour is to steep them in hot water for a few minutes.