This recipe makes about 1ltr, but if you have less or more Blackberries its easy to adjust.
Granulated Sugar (approx 600g)
1tsp Citric Acid.
Put the Blackberries into a large pan with 400ml of water over a low heat and gently cook for about 10 mins, squash the fruit with a potato masher to release the juice.
Pour the liquid into a Jelly Bag, or muslin lined sieve, set over a bowl and press to release the juices.
Measure how much juice you get and allow 300g of Sugar per 500ml of juice. Put the juice & sugar into a large pan and dissolve over low heat, do not allow the juice to boil. Remove at once and stir in 1 teaspoon of Citric acid.
When cooled a little, decant into sterilised cordial bottles with swing stoppers.
These 500ml recycled glass bottles are available from Lakeland at £3.99 each, but being reusable represent good value.
The Citric acid is to make the Cordial keep longer, up to a year, if you don't have any don't worry your Cordial will keep for a few weeks in the fridge anyway, if it lasts that long!
I found you only need about an half an inch depth of cordial in a half pint glass, before adding water, but you will know your own strength by trial and error. It's a perfect summer drink diluted with sparkling spring water too. Enjoy.
Thanks for reading/returning. Ian