As he tears off a leg of a charcoal-grilled rat at a roadside stall in western Cambodia, Yit Sarin hails the simple joy of rodent and rice washed down with beer."It's delicious," he says of the snack.Barbecued field rats are not everybody's idea of a tasty treat, but in Cambodia's rural Battambang province they are popular as a quick – and cheap – snack, with small skewered ones going for US$0.25 each while larger rodents can cost US$1.25.Rats were commonly eaten in t