Please control the prices of 'Nasi Kandar' in town.

I believe most of us who loved patronizing the local 'Nasi Kandar' restaurant around town would certainly agreed that the prices charged by them are way too high and sometimes crazy.
Just the other day my friend complained he got a shocked of his life when he ordered his meal at Restaurant DiKayu near Tesco Mutiara Damansara. He asked for some white rice, an egg and a tiny fried fishegg and this amounted to RM10. While his colleague paid RM15 for white rice, a piece of squid and one egg. Lets do the maths ourselves the cost would probably be less than 30%
I know most restaurant owners would justify by saying their food is good quality and they need to be profitable , but i consider it a crime for anyone overcharging their customer. Many customers would just come once and thats it. Worse still they will spread news about those restaurants guilty of overcharging to their colleagues.
Can our Ministry of Domestic Trade & Consumer do something about this?