It can be baked too long or too little. Inconsistencies in the batter produce uneven results when baked. He's adjusted the amount of anise, added Grand Marnier to an orange version and fiddled with the amount of whiskey. When fatigue sets in, and the biscotti needs to be bagged, their spouses are there to help. But even that has to be done to specification.
Appearance is important, naturally, but taste is paramount.
And Brix is confident when it comes to his biscotti. He bought biscotti at every bakery he encountered, in about six countries. 4 eggs 1 teaspoon almond extract 1 teaspoon anise extract 1 oz. 1 teaspoon anise seeds Toast almonds in a 300-degree oven. Cool and chop.