Kholodny kisel (cold berry kissel)

Instructions

1. Crush the red berries in a saucepan, then add 500 ml water and simmer gently for 5 minutes.
2. Pass the mixture through a fine sieve to obtain a smooth juice, seedless if possible.
3. Return the juice to a medium heat with the sugar, salt and lemon zest.
4. Dissolve the starch in the remaining 250 ml water until you have a smooth cream.
5. Pour the dissolved starch into the juice while whisking, then let it thicken for 1 to 2 minutes, stirring constantly.
6. Remove from the heat, divide into glasses or a bowl, let it cool, then chill for at least 2 hours.