After much trial and error, I have finally created a recipe for a lightly carbonated, delicately floral elderflower champagne. This should make six 750ml bottles. Ingredients:– Twelve to fourteen elderflower heads– Two medium sized lemons– 600g sugar– 1 heaped teaspoon of citric acid (optional)– 4.5 litres of water plus an additional 100ml overage for any…