There are signboards at the end of Kesas Highway that shows where Banting is headed. From there, take a look at this site for further details:
http://www.journeymalaysia.com/MHIS_jugraget.htm
I am afraid the food at this place is so so only. It was very famous, there was a photo of "Winners" (Alan Tam, Kenny B, etc) eating at this place during the 80's. But nowadays the food is average only. You won't see many local Banting people eating there.
Still if you want to go, it's about 10 mins after Banting town heading towards Morib. Best you ask for directions in Banting town coz the turn off to this place is not so clearly signposted, can be easily missed.