Combine
butter, mustard, and pepper in food processor, and whirl
to combine. Add cheese and whirl again to mix.
Add
flour and pulse just until blended.
Roll dough out on a lightly floured surface, to 1/4
inch thickness. Cut with desired small cookie cutter
and transfer to cookie sheet.
Sprinkle
chopped pecans over the top of the cookies.
Bake
at 350 degrees F. for about 20 minutes, until lightly
browned on the bottom.