Preheat oven to 300 degrees F.
Season entire pork butt with salt and pepper. Place pork in a roasting pan. Place in the oven and cook for about 6 to 8 hours or until the meat is falling apart. Remove from pan, and set aside to cool. Meanwhile, prepare the remoulade sauce. Place all ingredients in a food processor and process for about 30 seconds.
To assemble: Shred cooled meat into pieces. Slice the bread in half and spread remoulade sauce on both halves. Arrange a layer of shredded pork on top one half of the bread. Then pile a handful of shoestring potatoes on top of the meat. Cover with the other half of the loaf and cut sandwich in half. Serve immediately.