Storage: Store in an airtight tin. They keep well for several weeks.
Baking Tip: Be careful with the first baking of these biscotti. Even though they are baked a second time after being cut, if they do not bake sufficiently the first time, the biscotti will have a hard, heavy core.
Variation: If you cannot find bicarbonate of ammonia, use 1/2 teaspoon baking powder and 1/2 teaspoon baking soda as a substitute.