Take quarter cup of sugar in a thick-bottomed pan. Add a few drops of water and heat till the sugar caramelizes. Pour the caramel into a mould and let it settle by cooling. Heat milk either in a microwave oven or on gas flame. Place a metallic ring in the pressure cooker. Add four cups of water and heat. Break eggs into a bowl.
Add half cup of sugar, vanilla essence and mix gently with a whisk. Add warm milk and mix. Strain the mixture. Pour the egg-milk mixture into the mould with the caramel. Cover with aluminium foil and place it in the cooker. Cover with lid and steam for twenty-five to thirty minutes. Do not use the whistle. Remove when done. Serve, turned out with caramel side up, either hot or cold.