Preheat the oven to 350ºF (176ºC). In a large bowl, mix the dry ingredients. In another bowl, combine the honey, egg, orange juice, zest, vanilla, and chopped fresh rosemary. Combine the wet and dry ingredients. Mixture will be slightly sticky.
Place parchment paper on a cookie sheet and shape the mixture into a log about 9-12 inches long and 3 inches wide. Bake for about 25 minutes until the biscotti is lightly browned, but not a deep brown. If it gets too dark it will be hard to cut.
Turn the oven down to 275ºF (135ºC) and let the log cool for 5 minutes. Using a sharp knife, gently cut the biscotti into 1/2-inch pieces. Cutting biscotti can be hard to do neatly—do not be afraid! If you wipe off your blade between cuts, it will cut much easier. If you’re using nuts, you want to make sure that they are finely chopped, otherwise they will make the biscotti hard to cut neatly.
Place the biscotti back onto parchment paper with space between each piece. Let the biscotti continue to cook in the oven for another 30 minutes. Do not let the biscotti get too brown!
Pull the biscotti out of the oven and let it cool for another 30 mins. The biscotti will continue to harden as it cools. You can store biscotti in an airtight container for a week or more, but it never lasts that long for me! I often make a double batch of this one.