Roasted Vs Toasted Pecans: How And When To Use Each Method - Tasting Table
Briefly

Roasting pecans in the oven at a lower temperature, between 300 and 350 degrees Fahrenheit, ensures they don't burn and roast evenly.
Toasting is ideal for chopped pecans, cooking them quickly and allowing for a deeper color from direct contact with the hot pan underneath.
Pecans have a natural sweetness compared to walnuts, making them perfect for baking in sweet applications like pecan pie.
While roasting benefits whole pecans for their slow, even cooking, toasting allows for better control and faster results with smaller quantities.
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