I am making a bbq and decided to make salad. I am planning to put it in an aluminum tray. Question: how long can I leave it outside before it goes bad? Does it go bad since there is a cover for it? Should I put it in ice instead?|||Place Damp Paper towels over greens w/ a few ice cubes around the top . Or if you can use a Stainless Steel Salad Bowl & put the towel covered bowl inside a larger bowl of Ice Water

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