A few weeks ago I bought some raw walnut halves and pieces from Whole Foods. Since then, I've been storing them in an airtight container in the freezer. The problem is that the nuts taste bitter, alone or in cooking. Sauteeing them in butter or olive oil doesn't seem to help. All the recipes I've tried have called for raw walnuts, so I haven't tried dry toasting them yet. Might dry toasting help get rid of the bitter taste?