Steps:

• Cream butter until light and fluffy. Add sugar gradually. Add egg and vanilla, mixing well after each addition.
• In another bowl, mix together the flour, salt, and baking powder. Slowly add to the butter mixture, making sure all ingredients are incorporated.
• Divide dough into three equal parts. Add a few drops of red food coloring to one third, mixing until the color is even. Add cocoa and pecans to one third, mixing well. Leave the other third plain.
• Line a loaf pan with wax paper or foil. Press the chocolate layer into the bottom of the pan, pressing firmly to make the dough as flat and even as possible on top. Add the plain dough to the pan, again making an even layer on top of the chocolate. On top of the plain dough, add the red, pressing down flat on top. Wrap the dough completely, leave it in the loaf pan, and chill over night, or until firm enough to slice.
• Preheat oven to 325 degrees. Remove dough from loaf pan and place on cutting board. Cut the dough lenghth-wise, down the middle, so you have two long "bars" of dough. Put one bar back in the refrigerator, to keep chilled while you work with the other.
• Slice into about 1/8" slices, or thicker if you like them a little softer. The thinner they are sliced, the crispier they will be.
• Bake for about 10 minutes at 325 degrees. Take them out when the bottoms are just browned. Try not to overbake, or they will lose their pretty color.
• Cool on wire rack.

Steps:

• Preheat the oven to 375 degrees F (190 degrees C). Sift together the flour, cream of tartar, baking soda and salt; set aside.
• In a large bowl, cream together the butter, oil, confectioners' sugar and white sugar until well blended. Stir in the eggs, vanilla and lemon extracts. Gradually mix in the dry ingredients until well blended. Roll the dough into walnut sized balls. Place the cookies 2 inches apart onto the cookie sheet. Flatten cookies to 1/8 inch thickness using the bottom of a glass dipped in sugar. Colored sugar may be used if you do not plan to frost cookies later.
• Bake for 9 to 12 minutes in the preheated oven, or until the edges are golden brown. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.