Not a "brew" as such, but 9 litres (2 gallon demijohns full) of Elderflower champagne. Recipe from Berry's "First Steps.." units in old money: 6lb rhubarb chopped into ½ lengths and covered with 6lb sugar and left overnight and all morning for the sugar to extract the juice. Syrup poured into 12 litre beer fermenter and rhubarb washed and rinsed with sufficient water to make up to 9½ litres, washing the rest of the undissolved sugar off the rhubarb. Pitched with yeast and nutrient. After primary fermentation, I'll rack into demijohns with an ounce of dried elderflowers in each demijohn tied in a hop bag. When fermentation's finished I'll rack into Lorina swingtop lemonade bottles (used to get them in Waitrose) with a teaspoonful of sugar and leave for 6 months.
Still got some of last years and had one earlier in the week. Splendid stuff, if I do say so myself.