Toasting walnuts brings out their earthy flavor (and minimizes the bitterness of raw walnuts). There are two ways to toast walnuts, they both work very well, but they both require that one pays close attention – walnuts go from being toasted to being burnt in the blink of an eye!
How to Toast Walnuts In the Oven
Preheat oven to 375°F. Lay walnuts on a baking sheet (you can line it with foil or parchment paper for easy clean-up). Roast walnuts until they start to brown and smell toasted, 5 to 10 minutes.
How to Toast Walnuts On the Stove
Heat a large frying pan over medium high heat. Add walnuts to the hot, dry pan and cook, watching constantly and stirring frequently, until walnuts starts to brown and they smell toasted, about 5 minutes.