In a skillet, cook fresh milk and sugar until the sugar dissolves completely.
Now take a very small quantity of cold milk and dissolve corn flour in it and add to the boiled milk.
Keep stirring the milk mixture continuously. As it starts to thicken, beat it finely and let it cool.
Now beat fresh cream and coffee and add it to the corn flour custard. Now keep it in the fridge to let it chill.
Now add to it, banana slices along with cream and walnuts. Serve it chilled.