Famous Halal Cart - Weekends
Yes, they're there on weekends at 53rd/6th, and during the day, too. SouthEAST corner during the day (though slightly less fresh as there is less turnover) and southWEST corner during the night. Ignore the SW corner during the day -- that is an imposter.
Look for round containers, yellow bags, and yellow uniforms. The key is yellow bags.
The imposter has taken to copying the other cart's uniforms and containers now!