For the genuine article immerse 1 large tin of condensed milk in boiling water, and boil for five hours. Leave to cool and whip ¾ pint of cream with 1tsp sugar and ½tsp instant coffee powder until thick and smooth.
Spread contents of the can - it should be caramelized - over a baked shortcrust flan base and lay 1.5lbs halved bananas on top.
Spoon on the cream, sprinkle with coffee powder. Serves 8-10.