The cake that you see in the image does not have oil or butter. That does not mean that it is not caloric because we are going to put lots of nuts.
It is prepared in Little time. Of course, we will have to have a kitchen robot or with a mincer to turn the nuts into flour. From there we will only have to mix the ingredients well.
It's not too big but it doesn't have to be because one small portion it will be enough to enjoy its flavor and its properties.
More information - Fried donuts in Thermomix