Just as Doctor Bhang says, a lassi here will be 'your ticket to the moon'. The shop itself is not much to look at - a little hole in the wall place to the left of the main entrance to the fort with the sign "LASSI SHOP" (NOT the "Bhang Shop" around to the right which stole this business's name).
Doctor Bhang is a classic character, and meeting him and trying a fresh and delicious lassi here was a highlight of our trip to Jaisalmer. The cookies we bought were strong, and kept us going for the next few days. A must-try!