Sauté the banana pieces in butter or ghee and keep aside. Saute sugar in a pan. When it become light brown in colour, add 1/2 cup of water to it and make it a thick solution. Beat the eggs. Add milk and flour to it and stir well. Mix the sugar solution, vanilla essence and cardamom powder with it.
In a vessel place the bananas and pour the prepared solution above it. Bake it or cook in steam. Allow to cool and keep in the refrigerator to freeze. When it is done, replace it into a bowl and serve with orange sauce or vanilla ice cream.