Purple yam moon cake (紫薯月饼)

Same way to make and bake as the Lotus seed moon cake. The only difference is the filling.

To make the filling:

1. Peel purple yam (about 400 g) and cut into chucks to steam.

2. Blend the cooked purple yam with mixer. 

3. In a large fry pan, add 6 TBSP of butter, purple yam, 4 TBSP sweetened condensed milk, 1/4 cup sugar, simmer together. Gradually add 3 TBSP of corn starch and cook until the mixture can be easily folded with spatula.