2011-11-26 Scrub 4lb parsnips, slice&boil until tender (30mins-ish);
Strain into another pan onto 3lb sugar, 2Tbsp citric, 1/2lb chopped raisins: simmer 45 mins;
Add crushed Campden tablet, into fermenting bin, water to 5litres, allow to cool,
add nutrient, at 21C add yeast (Gervin GV1) and pectolase
Stirred daily 10 days,
2011-12-06 Strained into demijohn
2011-01-24 Racked
2012-03-07 Bottled. Drinkable. A few rough edges but not bad.
2012-06-24 Very nice. Bit strong - less sugar next time!
Not sure I'd want to do more than a gallon of it, all that boiling of the veg at the start would take a big pan....
There is more risk with a brew that doesn't fill the FV, but you should be OK, once it gets going a blanket of CO2 covers it. I think I oxidised my parsnip when racking and or bottling (consequently I now use Campden more often than most people - paranoia)