In a large bowl, add the condensed milk and 4 eggs. Beat with an electrical whisk for 2 minutes

In a deep metal tin, do as you would normally when you grease a pan with the caramel. Add 1-2 tablespoons extra of caramel to the bottom of the tin.

Place tin in a large saucepan then add enough water to reach half way up the tin. Cover with a lid that lets the vapor out.

Boil for around 20/25 minutes. Carefully add boiling water to the pan when needed. Do not go above half way up the tin. Also keep checking that its done it may take less time or slightly longer. For me it depends on which saucepan or tin I'm using.

Once it's completely cooled, carefully transfer to a plate. I find it easier to place a plate on top of the tin and turn it quickly. It should easily come free, if not tap the bottom of the tin until it comes free.