Possibly the most famous street food stall in all of Malaysia is the Penang Road Famous Teochew Chendul. If you've been to Penang then I'm sure you've had a bowl of their delicious cendol.
I was living in Penang during their 80th birthday celebrations and got to chat to the family and learn about their history, so I took photos and wrote an article: https://thetravellist.net/three-generations-of-cendol/