Step1:Slice purple potato, steam soft, mash banana and put it into the steamed purple potato. The whole process of electric stove fire is about 13 minutes. Let cool for standby. Soften butter and cut into small pieces. Add sugar. Beat in the eggbeater for about one minute until it is sticky. Add in the cold purple sweet potato and banana paste. Mix rum (not added), soda powder and spoon. Finally, add flour. Mix evenly (do not use hands. The purple sweet potato is too sticky). Wrap the dough wrap and put it in the refrigerator. Refrigerate for 3040 minutes. Freeze for 15 minutes. As long as it is not sticky, shape it slightly hard. Knead the long strip Put it in the refrigerator for a while, then preheat the oven at 160 degrees. Take out the hard dough. Slice. The thickness is about 3 to 5mm. Put it on the oil paper of the baking tray. Leave a little space between the biscuits. Up and down 170. Bake for ten minutes.
Cooking tips:Too much purple potatoes will stick to your hands. You can add a small amount of raisins, cranberries, pine nuts and so on to the dough according to your taste. There are skills in making delicious dishes.