Why did my onions turn blue?? : AskCulinary
Probably the mix of foil, acidic juice from the lemon, and the onions selecting up the discoloration from the response. Personally I by no means mix the rest acidic with aluminum foil, particularly no longer over prime warmth. I do not even stay uncoated aluminum cookware as a result of I to find it impacts taste and has a tendency to react to acidic stuff.
I love anodized aluminum pans although.