Rinse the lemons with hot water, press down a little and cut into slices. Briefly rinse the elderberry with cold water and then put all the ingredients in a large bowl, stir well and place in the sun or another warm place for 5-6 days. Stir frequently. When bubbles form, strain the soda through a strainer and fill into snap-cap bottles. Then just let it stand for another day and then put it in the refrigerator, otherwise more and more carbonic acid will form.
The soda can be stored in the refrigerator for about 2 months.
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