1. Prepare 8 kg of dark plum, 50 kg of sugar, 50 g of citric acid, 0.5 kg of osmanthus fragrans/kloc-0, 30 g of saccharin, 250 g of sauce color and 384 kg of concentrated sour plum juice 120 kg of finished products.

2. Cook sour plum juice according to the ingredients. First, clean the ebony, boil it in a copper pot (or aluminum pot), and filter (the remaining ebony can be soaked in boiling water and filtered) to make concentrated ebony juice.

3. make sugar sauce. Firstly, sugar is dissolved to make syrup with required concentration, then the syrup is filtered to remove impurities, boiled, added with other auxiliary materials, stirred evenly, and used after cooling.

4. Mix raw materials. Pour the cooled sugar paste into the concentrated sour plum juice to make sour plum sugar paste.

5. Add ice water, or add edible ice and sand to filter water to make sour plum soup.