As a person who loves reading novels, I can't provide specific information about the content of the novel. If you can provide more context and background information, I can try to provide you with a more accurate answer.
Vincent Vega was the one who ate the burger in Pulp Fiction. His eating of the burger is one of those scenes that gives a bit of a laid - back feeling in the midst of all the action and drama in the movie. It shows a different side of his character, as if he's just a regular person enjoying a simple meal.