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Mayonnaise is a not-so-secretly risky condiment. Every summer there space warnings about eating the potato salad in ~ the household picnic or lobster role at the coast that's been sitting out in the sunlight for hours, for are afraid of getting sick. You could be emotion brave and take a bite anyway, i beg your pardon begs the question. Exactly how long deserve to be mei be left the end of the fridge, really? and also what's the shelf life that mayonnaise anyway? Well, the really relies on what kind of mayonnaise you've obtained on hand, yet chances are an excellent it's much much shorter than girlfriend think.

To it is in clear, we're not talking about imitation mayo or vegan mayo here. We're talking about the shelf life of real mayonnaise, as characterized by the US government (because of food there's a regulation in the united States around what's actually thought about to be mayo and what's not). According to the united state Food and also Drug Administration, in the united States, actual mayonnaise requirements to be no less than 65 percent vegetables oil, through vinegar, lemon juice, and also some form of egg yolk.

It's the consist of of one egg yolk that makes mayo perishable and notoriously tricky to handle. "Traditionally, mayonnaise is made v raw egg yolks, and also therefore dead a slight threat of salmonella infection," explains food scientist Harold McGee in his book On Food and Cooking: The Science and Lore that the Kitchen, adding, "Manufacturers usage pasteurized yolks, and also cooks concerned around salmonella deserve to now discover pasteurized egg in supermarkets." This raw egg is part of the reason McGee recommends treating mayo, "as a extremely perishable food that need to be served automatically or preserved refrigerated."

Most advertising mayonnaises, favor Hellman's real Mayonnaise or teacher Kensignton's Mayonnaise, space shelf-stable prior to opening. That's why the bottle or jar deserve to sit unrefrigerated in the supermarket. But once you open it up, you've obtained to save mayo in the fridge, and Sir Kensington's notes the refrigerated mayonnaise will "be for sure to enjoy approximately 2 month after you an initial open her jar or bottle." for this reason if you've had actually an open jar of mei in your fridge for the much better part the the year, it's most likely time to throw that stuff away.

The perishable nature that mayonnaise is also why you must throw out mayo that's to be left the end unrefrigerated overnight. It can be totally fine—until you acquire food poisoning. And, in general, the FDA proposal tossing perishable foods, including mayo, that have actually been left out at room temperature for two or more hours.

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So put that mayo in the fridge and also replace it after 2 months, or simply make your own mayo and also use it ASAP. Simply be smart, and also please don't gain salmonella from her potato salad.