Preparation time: N/A minutes  Servings: about 3.5 litres of cordial/60 drinks Cook time: 15 minutes Total Time: 24 hours Difficulty: easy Ingredients: 2.5 l water 450g /1 lb elderflower heads (around 50x elderflower heads) 2kg sugar 2 tablespoons citric acid lemon juice from 4 medium …