I found this in the October 1952 edition of East Anglian magazine, picked up from an antiques store in Suffolk.
Mrs. Goodman’s receipt 1883
Boil 1/2 pt. hops in 1 gallon of water for two hours. Strain and sweeten. Pour into earthenware vessel, float a slice of toast on top with a spoonful of brewers’ yeast on it. Cover and leave all night. Next day, remove toast, skim top and it is ready to go to the harvest field. This does not keep well: fresh supplies must be made daily
So if you put toast on beer, you can put beer on toast?
This is the 2009 limited edition Marmite, made with yeast used in the process of brewing Marston’s Pedigree. It didn’t taste particularly different to normal Marmite to me, and was sadly alcohol free, but then all Marmite is made with excess yeast from brewers. Some of the yeast extract comes from the Bass brewery in Burton on Trent and other breweries in the vicinity. Molson Coors say ‘about 90 per cent of the excess yeast the brewery produces is used to make Marmite‘