The Fail-Proof Ingredient For More Flavorful Roasted Vegetables - Tasting Table
Briefly

Roasting vegetables enhances their flavors and textures; mayonnaise can act as a superior roasting medium, sealing in moisture and providing a crispy exterior.
Unlike oil, mayonnaise’s egg yolk content adds flavor while its higher smoke point ensures better browning, making it ideal for vegetable roasting.
By using mayonnaise, you can achieve a more even coating on vegetables, which allows seasonings to adhere well and infuse flavors during roasting.
For mayonnaise-roasted vegetables, use about a quarter cup of mayonnaise per pound, double the typical oil amount, for optimal flavor and crispiness.
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