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Sep 17, 2009 09:43 AM

Marinating with lime in foil; problem?

I am marinating some carne asada with salt and lime. I wrapped it up in foil. Someone told me to take it out of the foil because there would be a bad reaction... anyone heard of this? Thx!

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  1. yes. acid is not a good idea with foil - it'll eat through it, and can potentially also leach metals from the foil which will contaminate the food (and turn your meat black).

    1. Generally, I've been told not to cook acidic foods in either aluminum or cast-iron cookware. Might be a similar issue of interaction with aluminum foil, especially if left for some time. I usually just marinate with lemon or lime in a plastic bag.

      2 Replies
      1. re: markabauman

        Acidic foods in foil = bad idea. Acidic foods in cast iron; depends on what you're trying to protect. The acidic foods are damaging to the seasoned surface of cast iron and those types of cookware need to be re-seasoned more frequently when cooking acidic foods in them but I've never found any adverse affects to the foods cooked in cast iron and I use it almost exclusively. Tomato sauce raises heck with the seasoned surfaces so I soak the pan in hot water immediately after cooking with that and other acidic ingredients to reduce the level of re-seasoning necessary.

        1. re: todao

          Some people (myself included) will intentionally cook acidic foods in cast iron pans to increase the iron content in my food (as I tend to be borderline anemic).

      2. Acidic ingredients do eat through foil, though it takes a good long while. Still, better to avoid contact with the foil. If foil is the best wrap for a particular purpose, you can always put a layer of parchment or plastic wrap between the food and the foil.

        1. Within hours, the acidity of the lime juice will perforate the foil, and you'll have a mess.

          1. Everyone else is right - and if you want to use foil over plastic wrap (which I do b/c I can recycle the foil), just put your meat & marinade in a bowl/Pyrex and then cover the top w/the foil . . . .