In "Pulp Fiction", what kind of burger did Jules eat that belonged to Brett?

In the film "Pulp Fiction", Brett is eating a Big Kahuna Burger when Jules and Vincent show up at his apartment. It is Jules who refers to the name of the restaurant where the burger can be purchased.

Vincent says, “That is a tasty burger!” Big Kahuna Burger is a fictional chain of Hawaiian-themed fast food burger spots found in Los Angeles, CA. They were dreamed up by film director, Quentin Tarantino. The burgers first appear in the film "Reservoir Dogs". Mr. Blonde goes and gets a burger and soda after a diamond heist takes place. In the next film "Pulp Fiction", Jules consumes Brett’s burger and soda before shooting him to death.

The burger chain is later used in the Tarantino film "From Dusk Til Dawn" (George Clooney’s Seth Gecko is seen holding a Big Kahuna takeout bag). Also in the Tarantino flicks "Four Rooms" and "Death Proof", Big Kahuna Burgers appear. Tarantino never opened a real-life Big Kahuna Burger out in L.A.