I am a regular air traveller and have patronized practically every food outlet in klia. Eden is by far the best. In fact, it is probably the only real 'restaurant' at the airport as it offers full service, has an extensive menu and a nice, comfortable atmosphere. The dim sum is brilliant for breakfast and the double boiled soup and venison dish are quite exquisite. Prices are slightly high but to be expected in such a restaurant, esp in an airport where rental is known to be high. Nice little lounge area as well if you are not rushed for time.
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