Whip nut nougat cream, sour cream, espresso powder and cocoa. Whip cream until stiff. Fold in the pistachios, except for something to garnish, and cream. Wash the apple, quarter it and remove the core.
Cut the apple quarters into small cubes, possibly drizzle with a little lemon juice. Fill nut nougat cream into glasses. Spread apple cubes on top and sprinkle with remaining pistachios. Decorate with mint.