Soak elderflower in rosé wine for about 8 hours. Then pass through a cloth. Clean the strawberries and cut into small pieces. Bring the strained wine with the citric acid and the preserving sugar to the boil, when it boils, add the strawberries and cook for 4 minutes. Fill into prepared twist - off glasses, making sure that there are strawberry pieces in each glass. Now turn it upside down for 5 minutes, but then turn the glasses again and again so that the strawberries are later distributed all over the glass. This amount gave me 14.5 glasses of 230 ml each.