1. Mix the white granulated sugar and grass powder and stir evenly to cool down
2. Cut purple sweet potato taro sweet potatoes into pieces and steam them in a pot
3. Separately mix the steamed ingredients with white sugar to make a puree
4. Mix in cassava flour and knead into a ball and roll into a strip
5. Cut into pieces
6. Boil the cut pieces and put them in ice water to cool
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