But first a note on the flowers. Pick the flowers early. Not too early that the flowers haven't opened, but not too late that they have started to turn brown and smell of cats wee.
For 1 litre of cordial, you need to pick about 20 large flower heads.
The best flowers are often quite high so unless you want to carry a ladder/chair with you, I find it best to use scissors and 'jump and snip' so that they fall to the ground. Maggie then gathered and counted.
Use a heavy based large pan over a high heat. To 1 litre of boiling water, add 1.8kg of caster sugar and stir over the heat until the sugar has dissolved. Remove from heat. Zest and juice 2 lemons, then slice and add to pan. Add 75g of citric acid and the elderflower heads. Leave to infuse for 24 hours. Strain through muslin and pour into steralised bottles. Done. Easy peasy hey and a lovely gift.
This is where we walked home to our barn with our elderflowers.