Mix dries in a large bowl. Add nuts and chocolate chips to dries and stir.
In a separate bowl, combine eggs, oil, and vanilla and mix well. Add egg mixture to dries and mix well.
Place dough on floured board and knead until smooth and no longer sticky. (The dough will seem very sticky and oily at first.)
Divide dough into equal thirds and shape each into a log about 10 to 12 inches long and 2-3 inches in diameter.
Press down on the logs to flatten just slightly into ovals. Can bake immediately or refrigerate until ready to bake.
Bake in a 350-degree oven for 25-30 minutes, until lightly browned.
Remove from the oven and cut each log into 1/2 to 3/4-inch slices on the diagonal.
Return to oven and bake for 10 minutes longer. Cool on the pan before separating slices.
When cookies are completely cooled, dip them in the melted chocolate and sprinkle chopped pistachios over the chocolate immediately.
Allow chocolate to harden before storing in an airtight container.