Elderflower Cordial Concentrate

24 elderberry flower heads

4 ½ cups white sugar

1 ½ quarts boiling water

½ cup fresh lemon juice

2 ounces citric acid powder

Combine the elderflower heads, sugar, lemon juice, and citric acid in a large acid-proof container. Pour the boiling water over the ingredients and let steep for 24 hours, stirring occasionally.

Strain the liquid by pouring it through muslin into a large bowl. Ladle into bottles and refrigerate, or pour into freezer containers and freeze.