Sorrel thoroughly wash and finely chop. Put into a saucepan, add a little water, put on a little fire and cook 5-6 min., Until soft. Broth drain, sorrel rub through a sieve and return to broth.
Dilute starch in half a glass of cold water and stir thoroughly.
Pour into a saucepan with sorrel 0.75 liters of cold water, add sugar and bring to a boil, cook for 3 minutes. Pour a thin stream of dissolved starch. Stir, bring to a boil again, remove from heat, cool and pour into glasses.