Step 1

Preheat oven to 360 degrees

Step 2

Butter the bottom and sides of a spring form cake tin

Step 3

In a large bowl, cream the butter and sugar until light and creamy

Step 4

Beat in the mashed potatoes, ground cashew nuts, zest of lemon and orange

Step 5

Add in the egg yolks one at a time and blend well.

Step 6

In a separate bowl, whisk the egg whites until stiff

Step 7

fold the egg whites into the batter

Step 8

Pour the batter into the cake tin

Step 9

Bake in the oven for one hour or until golden brown

Step 10

Remove and let cool before removing from the form.

Step 11

garnish with a few roasted cashew nuts

Step 12

Enjoy!