2. Ingredients: 200g sweet potato, 1 0g butter, 20g sponge sugar,10g lemon juice,1egg yolk, 25g whipped cream, 5g brandy and15g egg yolk.

3. Peel the sweet potato first.

4. Cut into small pieces and cook in a pot.

5. After cooling, mash it with a stick.

6. Add sponge sugar, butter and lemon juice and mix well.

7. Add egg yolk and whipped cream and mix well.

8. Add brandy and mix thoroughly.

9. Put it in a decorating bag and extrude it in a boat-shaped mold with a serrated decorating nozzle.

10, baking in the furnace, baking at 2 10/200℃ until the surface is set, and brushing egg yolk liquid on the surface.

1 1, and then continue baking until the surface is colored.