Remove the wrapper from the can of condensed milk and place it, unopened, in a large pot of water. Bring the water to a boil, making sure the water level is above the top of the can. Continue to boil (adding more water when you need to keep the level high) for 3 or 4 hours. Let the can cool completely. When it's cool, open it and you'll find you have a can of toffee cream. Spoon that into a pre-baked or graham crust that you can eat. Slice over some bananas to cover the top. Add whipped cream. It's rich and creamy and delicious and the easiest thing ever.