Eating in Cambodia is very cheap...in fact, food in Cambodia is fairly inexpensive to buy there so you'll be surprised how far the dollar goes there even today. I suggest eating from local street vendors who charge around $2 per meal. Other than that, a traditional Cambodian restaurant meal will set up off around $4 per meal.
I don't know why so many tourists are so squimish to eat from street vendors. Best food is eating on the street and it's so cheap whether you stay in Siem Reap, Sihanoukville, Phnom Penh or even rural Battambang. Saying this, there are still some very good restaurants around like the Bayon restaurant and Chivit Thai.
cambodian food delicacies eating is a way of life in Cambodia and if you love your food you will love there. a few things you can expect to eat are crickets, fried spider, fermented fish paste (prahok), tiger *****, fertilized duck embryos (balut). This last one is consider to be an aphrodisiac and a high-protein, hearty snack. It is commonly sold by street vendors and often served with beer.
To be honest, food in Cambodia is a bit of a let-down so eating out in Cambodia isn't quite the same as other places like Thailand or Singapore. Most of the food places in Cambodia are western style eateries. Better to stick to Siem Reap and eat from local eateries there like Khmer kitchen.
Cambodia food has special flavor with cheap price. You can take a food tour to explore Cambodia cuisine.