Dulce De Leche is very easy to make if you have a pressure cooker. All you need is:
2 cans sweetened condensed milk
1 lemon or lime (only to keep your pot looking nice)
Place cans, make sure you rip off the label first, limes and enough water to cover the cans fully in a pressure cooker.
Be aware to follow your cooker's guidelines for how much water to fill it with, do not over fill.
Close lid, sealing the pot, and place cooker in stove, when it starts making the pressure noise, time it for 40 mins.
When it is done turn off heat, and let sit until pressure has come back down.
IF YOU DON'T HAVE A PRESSURE COOKER, you can still do it, it will just take more time. Boil it in a good size pot for 2 hrs, making sure your water stays covering the cans.