If the queue is too long or you find yourself craving it when you're further downtown, go to the Halal Guys brick and mortar location on 14th and 2nd.
Fun fact: the storefront had just opened a few days before Little Timmy was born (at Beth Israel a block away from there) last July, and a lamb sandwich was the first thing I ate after my son entered the world. Surely that has to add to both his and its credibility, right???
Tim