Cherries wash, pit. Weigh 1 kg of cherries, mix them with jam sugar, cover and leave to soak for 3-4 hours. Bring to the boil while stirring and let it boil fizzily for at least 3 minutes. Stir in vinegar. Pour jam immediately into hot rinsed glasses, close them tightly. Put the jam on the lid for about 5 minutes, because
3-4 hours waiting time