Sorry for tardiness in answering your request for the 'fartichoke' recipe - haven't been online for a while.
Have just made 6 gallons with this year's crop (and still a thrid of a row of the blooming things left...
To make 2 gallons:
8lb Jerusalem artichokes
2 and a half kilos of sugar
One 245ml tine of white wine concentrate (from Holland & Barrett or similar - if you come to the mainland Wighty there's one up Shirley High St that does brewing stuff)
6 teaspoons of citric acid
2 teaspoons pectolase
2 teaspoons of super wine yeast (or yeast & nutrient as on packet)
1. Scrub artichokes - sod peeling! and roughly chop up
2. Boil artichokes until soft in about 6 litres of water(ish) - just over 'al dente' otherwise the stuff'l never clear
3. Strain the resulting juice into another pan, add sugar, some water (so that total liquid is about 8 litres) and grape concentrate and boil the whole lot up for about 45 minutes.
4. When lukewarm add yeast, pectolase & citric acid, put in 2 demijohns up to shoulders, fit airlocks etc.
5. When it calms down and the yukky stuff sinks to the bottom (about a week) then rack off to clean demijohns and ferment to clear, racking again if necessary.
Last year's 'vintage' (a moderate 4 gallons) went down very well after about eight months but to be honest could probably have benefited from a little longer in the maturing....!!!!