8 Mistakes Everyone Makes When Roasting Vegetables - Tasting Table
Briefly

Choosing the best pan for roasting vegetables might seem like a no-brainer. A roasting pan may sound like the obvious choice, but it's not the best tool for this particular job. Roasting pans are typically made with sides that are inches high, which is one of the characteristics of what makes a roasting pan stand out from a regular one, creating depth to accommodate whole chickens, turkeys, and large cuts of meat. However, these high sides trap heat and steam, preventing the vegetables from achieving the perfect crispness and browning that makes roasted veggies so appealing.
The goal when roasting is to have veggies that cook up crisp on the outside with tender centers. If your pan has sides, it will trap heat within the pan, creating steam. This steam will soften your vegetables, and they won't undergo the Maillard reaction, which would cause them to brown and deepen their flavor. Thus, understanding the simplest aspects, like choosing the correct roasting pan, is crucial for achieving the perfect roast.
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