*Toast pecans by placing them in a single layer on an ungreased pan and baking them in a preheated 350°F oven for 7 to 9 minutes, or until they smell "toasty" and are beginning to brown.
In a large mixing bowl, cream together the butter, shortening and sugar, then add the eggs one at a time, beating well after each addition and scraping down the bowl midway through. Beat in the vanilla, baking powder and salt. Mix in the flour, 1 cup at a
Transfer the dough to a work surface (we don't bother to flour the surface; the dough is sticky, but is easily scraped up with a bench knife or dough scraper). Divide it into three fairly equal pieces, and shape each piece into a rough 10-inch log. Transf
Bake the logs in a preheated 375°F oven for 20 to 25 minutes, or until they're beginning to brown around the edges. Remove them from the oven, and allow them to cool for 30 minutes. Lower the oven temperature to 300°F.
Gently transfer the logs to a cutting surface, and use a serrated knife to cut them on the diagonal into 1/2-inch wide slices. Because of the nuts and the nature of the dough, the biscotti at this point are prone to crumbling; just be sure to use a slow,
Return the biscotti to the 300°F oven, and bake them for 20 minutes. Remove them from the oven, quickly turn them over, and bake for an additional 20 minutes, or until they're very dry and beginning to brown. Remove them from the oven, cool completely, an