Surely there can only be one Sim Lim Square?! It has been about 15 years since I lived next door, but the hawker stand I'm thinking of was called something generic like "Afghan and Pakistan Foods". The naan was the highlight, but the curries and stews were great as well. They had this really big taciturn dude who would work the dough between his hand and fist before throwing it in the tandoor. So good!