Put the gelatin sheets in a bowl of cold water and leave to soak for 1-2 minutes. Pour half of the wine into a saucepan and add sugar, heat over medium heat until the sugar is completely dissolved. Remove the gelatin from the water by hand, squeeze out the excess liquid a little and put it in a saucepan with wine. The wine should be hot, but not boiling, because gelatin will not work in boiling and jelly will not take, and gelatin will not dissolve in cold. When the gelatin is completely dissolved, pour in the remaining wine and lime juice. (If you use granulated gelatin, you will need one bag weighing 11 grams. Just pour the gelatin into the wine with sugar and heat until the gelatin and sugar are completely dissolved.) Let the wine cool down.