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Good question. Here's some wise advice: Never assume anything when it comes to cooking in the kitchen (and especially when there are dinner guests involved!). Unless stated specifically in the recipe, don't provide full lid coverage. Locking in the heat will actually prevent you from achieving that golden-brown crust that's sure to wow your dinner crowd. As for the disposable debate, although they're not as thick and sturdy as regular roasting pans, the throwaway versions will step up just fine in almost any last-minute pinch—and without a glitch!