Colourful variant of the french Pommes duchesse.
500g purple potato
6 egg yolks
Cook potatos in salted water.
Preheat oven to 200°C.
Peel potatoes and press through ricer.
Add butter and egg yolks, mix it well.
Press them on baking sheet with help of an icing bag.
Bake for 10-15 minutes.