Storage: Store in an airtight tin. These cookies keep well for several weeks.
Variation: You can substitute roasted chopped almonds for the hazelnuts.
Variation: For a different flavor profile, try substituting the Frangelico with anise liquor and adding a handful of anise seeds to the dough.
Serving: These biscotti are traditional for dipping in espresso or sweet Italian wine like Vin Santo.