Into a blender, add the cookies and the eggs, add the milk, the vanilla essence and the sugar, blend all the ingredients very well for 5 minutes on high speed.
After this indicated time, set aside.
Now into a cake tin over low heat, add the sugar and once it starts to caramelize, stir very well with a spatula until it turns into caramel sauce. Spread this caramel sauce all around the cake tin.
Once you’ve done that, let the cake tin cool for a bit and pour in all the flan batter.
Then cover the cake tin with aluminum foil and set aside.
Into a very large saucepan, add the hot water and put the cake tin into the pan.
Cover and let it cook for 2 hours.
After this indicated time, remove the foil and using a toothpick, check if it has cooked through.
If it hasn’t cooked yet, leave it cooking for a bit longer.
Once the flan has cooked through, let it cool then transfer it to the fridge and let it chill there for about 2 hours.
Unmold and serve.