This elderflower cordial is made without citric acid. It is free from all allergens but does contain a lot of sugar.
Add the boiling water and give a good stir.
Gently wash the elderflowers then place in the pan.
Using a peeler, remove the zest from the oranges and lemons and place in the pan along with the juice of one orange and one lemon.
Leave covered for 24-48 hours before straining through a clean muslin cloth or tea towel (lining a colander over a big bowl and gently pouring the liquid in is the easiest way to do this).
Use within about 6 weeks, or freeze some and defrost it when you want it (you could do this in ice cube trays, in which case you would have a ready-made ice cold drink when popped into water!)