Cream the butter, shortening and sugar
Add the eggs one at a time, scraping the bowl each time
Add the vanilla and Solera Sherry
Mix all the dry ingredients together in a separate bowl
Add the dry ingredients in in two batches until well mixed
Transfer the dough to a table and divide the dough into three equal pieces
Shape each piece into a log about 10” in length
Flatten slightly
Bake the logs at 300 degrees for 20 minutes in a convection oven (350 for 30-35 in conventional)
Cool the log and slice them in 1” thick slices once cool
Now lower the oven temperature 50 degrees and bake on the biscotti a second time 20 minutes on each side turning the biscotti over after the first 20 minutes
Once cooled dip in chocolate laced with MH port