Remove the elderberries from their umbels using a fork or place them in the freezer and remove the berries easily while they are still frozen.
Weigh the berries before placing them in a suitable kilner or tub.
Add 500ml of apple cider vinegar for every 350g of fruit.
Leave covered for 5 days, stirring occasionally.
Strain off the liquid, pressing the berries with the back of a label as you do, before discarding the spent berries.
Add 350g of white(ish) sugar per 260ml of liquid.
Simmer for 10 minutes then bottle.