Heat the water in a saucepan or in a kettle. The hot water in a container, e.g., fill a measuring cup. Put the tea bags in the hot water and let them steep as needed. Put the finished tea in the refrigerator for a few minutes.
As long as the tea cools down, have 4 glasses ready. Fill any number of ice cubes and 100 ml lemon iced tea into each glass. Fill the glasses with the raspberry cassi tea, which has now cooled down.
Add a few frozen fruits of your choice. Finally stir well again!