These can be stored for 2 weeks or longer in an airtight container.
Use a blackening over ripe banana for the best banana flavour.
To toast walnuts , heat at 180 C for 8 to 10 minutes in the oven or on a dry pan stovetop . Rub the skins off the toasted nuts and chop coarsely.
Remember that the wider your dough log is, the longer your biscotti will be . It will increase in length during the first bake. So make a narrow log if you want shorter cookies or divide the dough into two longer narrower logs .
While slicing , its best to use a serrated knife. If the cookie breaks or crumbles , chill for 5 more minutes and try.