The burger consists of a 1/3-lb. charbroiled Black Angus beef patty served along with 3 oz. of pastrami, mustard, red onion, lettuce, tomato, and pickle on a premium bun.
Carl's Jr. first introduced the Pastrami Burger on the menu for a limited time back in last 2004. They brought it back in 2006 which makes for a pretty long gap since it's last been seen.
The burger does not appear to be available at Hardee's (Carl's Jr.'s sister chain).
Photo via Carl's Jr.