1. Prepare frozen egg tart crust, whipped cream, pure milk, condensed milk, soft white sugar, egg yolk, low-gluten flour, purple sweet potato, purple sweet potato after cooking, cut into small pieces
2. Put the whipped cream, milk, sugar, and condensed milk in the tart crust, pour it into a small container, and stir while heating until the sugar is completely melted
3. Put in cold tart water, add two egg yolks, sift in low-gluten flour, and mix well
4. Sift the tart water, pour it into the tart crust, 8-9 minutes full, preheat the oven to 220 degrees, 20 minutes, and bake the penultimate layer.
