Boil the potatoes, peel them and smash them in a bowl to create a sort of purée.
Add flour, sugar, orange juice, grated orange zest and 1 spoon of vanilla extract.
Mix everything together.
In another smaller bowl, add warm water, warm milk and 1 spoon of dried yeast and mix it until the yeast is completely melted; add it to the mix.
Keep mixing it together until the dough becomes consistent (it will be really sticky).
Let it rest for a 1h in a warm place to let the dough rise. - Grab some of the dough with a wet spoon and fry it in hot seed oil until it will golden on both sides (you can do this also by creating little balls with your hands, just make sure to wet them first!).
Let it dry on some paper towels and roll it inside a bowl full of sugar (add some cinnamon too, if you fancy it!).