http://www.asiafood.org/country_cambodia.cfm
Cambodia
The food of Cambodia resembles closely the food of Laos and Thailand. Even the names of certain ingredients and dishes have similar pronunciations.
There is a reliance on fish and rice, vegetables of the region, green leaves and shoots, flavouring herbs and the ever-present fish sauce which is used to season any dish put on the table. Predominant flavours in most dishes are garlic (kthem), galangal (rom deng), ginger (khnei), kaffir lime leaves (sleuk kroy saach), fresh coriander (wun swee), mint (chee on kham), basil (chee krohom) and eryngo (chee bonla).
Rice is eaten three times a day. At breakfast, rice porridge is eaten with either fried salted fish or pickled mustard cabbage to enliven its blandness. At midday and for the evening meal, long-grain white rice is the foundation of the meal, together with the stir-fried dishes and curries. Rice is always cooked without salt and the curries are somewhat similar to Thai curries, though not as spicily hot. They are rather liquid, and usually combine vegetables with meat, both to extend the dish and because Cambodians like the way pumpkin, squash, beans and other bland vegetables take on flavours of the curry.
For frying, pork fat is the preferred medium, both for its availability and flavour. When grilling whole fish, it is usually with the scales left on to protect the delicate flesh. The Mekong River flows through this country as it does through Laos, supplying both with an abundance of freshwater fish, but Cambodia has, in addition to this source, access to seafood from the Gulf of Thailand. Fish is the major source of protein, whether as fresh fish, salted and dried fish, or the salty, fermented pastes so essential to the flavours of this region.
Soups are clear, with the refreshing piquancy of tamarind, tomatoes, lime or unripe pineapple. Meat is most often pork or chicken but sometimes beef or buffalo. It is always highly seasoned, so a little goes a long way. Game birds are favoured eating too, some of them smaller than sparrows.
Tea and coffee are not beverages of choice in Cambodia. Orange juice is popular. It is common for cups of steaming water to be sipped during a meal, as it is believed this helps digestion.