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Is this method safe to make dulce de leche?

I'm extremely conflicted about trying a recipe for dulce de leche. I've read so many times that boiling a can of sweetened condensed milk for dulce de leche is perfectly safe, just as long as the can stays covered by the boiling water. I saw another recipe that recommended using a slow cooker for this.

I thought the can would explode if you do this. Would it work if I punctured vents into the top of the can and pour water till it reached the 3/4 way up the can and simmer it for the required 2 to 4 hours to reach the proper consistency.

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    1. No need to puncture the can. I do this all of the time and it works beautifully. Good luck! You'll love it.
      Hank

      1. I just did my first can by the boiling method and it worked beautifully! Haven't tried the slow-cooker approach, but I think that a vent might be in order just to be on the safe side

        1. The following link has alternative methods for making Dulce de Leche -- stovetop, oven and microwave:

          http://www.verybestbaking.com/recipes...

          1. I've done this on several occasions and never had an issue with it. It still makes me nervous, but there have been no explosions.