Grind the cookies into crumbs and add soft butter. Mix well.
Cover a deep plate with cling film and lay out a cookie crumb, tamp with bumpers.
Spread banana slices over the surface of the dough.
Pour gelatin over water so that it swells, then melt in a water bath. Beat sour cream with sugar and add gelatin, whisk again. Pour our cake with sour cream, cover with cling film and refrigerate until completely frozen.
Grind the nuts, you can pre-fry a little in a dry frying pan. Turn the banana cake on a flat dish, cut into pieces and dip each in nuts.
A banana cake without baking is ready.