I cooked a pot of beans with some red onions last night. Today for lunch when I got them out of the fridge, all of the onions had turned a blue/green colour!
They still taste ok, but sure looks unappetizing!
Any ideas what's going on here?
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Which kind of beans did you use?– Dr. belisariusNov 26, 2010 at 18:01
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Great northern white beans.– Chris AtLeeNov 26, 2010 at 18:23
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2 Answers
The pigments that give onions the colour behave like a litmus test. They are red in the naturally acidic onion. They turn green/blue in an alkaline environment. It sounds like when you cooked the beans it created that alkaline environment to cause the colour change.
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5Preparing your own indicator solution with red cabbage juice is a safe and fun little experiment.– Nick TNov 27, 2010 at 3:34
Cooked red onion does turn dark blue-green colour in the fridge, but when you warm it up it turns a reddish colour again.
