How Long Is The Shelf Life of Mayonnaise After It Is Opened? Mayonnaise, a beloved emulsion of oil, egg yolk, acid (vinegar or lemon juice), and seasonings, is a refrigerator staple. Its rich, creamy texture enhances sandwiches, salads, and dips. Yet, a common question lingers in kitchens worldwide: Once opened, how long does mayonnaise remain safe and flavorful? The answer intertwines food science, microbiology, and practical storage wisdom, debunking myths along the way. Contrary to popular belief, a jar of opened mayonnaise doesn’t become a ticking biological time bomb. When handled correctly, it boasts a surprisingly robust shelf life. This article delves into the factors that determine its longevity, signs of spoilage, and best practices for maximising both safety and quality.
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