I had frozen blackcurrants, but you can use absolutely any berries instead – strawberries, raspberries, blueberries, even sea buckthorn. That’s just if the berry is sweet, you will have to add more juice of half a lemon or reduce the amount of sugar, which you will have to find out experimentally by taking a sample))
Wash the berries and put them in a blender bowl, add sugar and chop.