what you need:
1 can of sweetened condensed milk (regular or low fat)
There are two methods of making it
How to make it
Stove Top Method
Note: It is VERY IMPORTANT to ensure that the entire can is covered with water at all times!
Remove the label from the can.
Place the unopened can on it's side in a large pot and fill with water so the water is 1" above the can.
Bring to a boil, reduce heat to a medium boil. Let boil 3 hours topping up with water as needed.
Remove from heat and let cool before opening.
Easy just takes awhile
Also easy and you don't have to stay around to keep an eye on it.
Slow Cooker Method
Place unopened can in slow cooker on it's side.
Fill slow cooker with water so the entire can is submerged. Cook on low 8-10 hours.
Cool before opening.