Preheat oven to 375 degrees F.

In a large bowl, cream together the butter, canola oil, 1/2 cup sugar and powdered sugar until smooth.

Beat in the egg, then stir in the vanilla. Combine the flour, baking soda, cream of tartar and salt; stir into the creamed mixture. Mix in the pecans.

Roll dough into 1 inch balls and roll each ball in remaining white sugar. Place the cookies 2 inches apart onto ungreased cookie sheets.

Bake for 12-14 minutes in the preheated oven, or until the edges are golden. Remove from cookie sheets to cool on wire racks.