Bring a pot of water to a full boil. Cook the red beans until the skins split open. Remove from heat, drain, and cool. Put into a blender or food processor with 1 / 2 cup water.
(2) 煮一鍋清水，大滾後，將泡好的紅豆倒入煮至豆皮裂開，撈起稍涼放進果汁機中，再加半碗清水，打成細糊，裝進乾淨的布袋中紮緊袋口，用力壓去水分。