Start this recipe by cutting out a small slice of the skin at one end of the hot dog, to represent the nail. Also, cut small lines in the skin to create wrinkles around the knuckles and under the nail. Slit your hotdog buns and warm slightly in the microwave along with the caramelized onions and hot dogs. Spoon some onion in the bottom of the bun, squeeze in some ketchup and make it messy. Place in the finger hotdogs and dirty slightly with more ketchup to look bloody.