If you happen to be visiting KLCC, to have a look at the Petronas Twin Towers...do take the time to try out the various food outlets in the shopping mall Suria KLCC .
The prices can be rather expensive though, but it just depends on your budget..
If you are on really tight budget, one of the cheapest places to eat is at the Cold Storage takeway food area.
You can get a pack of fried rice or fried noodles for only RM 2.20 (USD0.60) . The fried rice is slightly spicy, but rather tasty actually even for a quick lunch if you happen to be on job assignments in KLCC.