Sweetened condensed milk that is. I blew a can when i was nine by being distracted 20 mins and redecorated the kitchen walls.
A neighbor brazilian mom next door whose husband was a Ferrari mechanic and racer taught me this.
You are making Dulce de Leche. (milk jam) which is used in South America much in the same way peanut butter is here. I have had it in sandwiches, between cookies (Alfajores) as a filling in cakes, spread on crackers.... any way you can think of is acceptable!
I did happen to notice some already made in the mexican food section of my grocery. That may save you the worry of exploding cans. I haven’t had any in many years..... think I may make some. Thanks for the reminder.