Bang Kwang Central Prison is known as the “Big Tiger” because it “prowled and ate” those sentenced there.  This harsh prison not only houses a multitude of foreign prisoners, but it is also home to death row inmates and long-sentence prisoners.  All new prisoners are required to wear leg irons for the first three months and death row inmates actually have their leg irons permanently welded on.  

From the Wikipedia Page: http://en.wikipedia.org/wiki/Bang_Kwang_Central_Prison
Prisoners receive one bowl of rice in vegetable soup each day. Other food must be purchased from the prison canteen. The prison works on a chit system. Each prisoner has an account with the canteen. Poor prisoners do chores for wealthier prisoners and prison guards to earn money for food. Some British and Lebanese prisoners receive extra money per month from charities. The British Embassy also provides food and vitamins for their prisoners. Prisoners are provided with cooking facilities and gas for the stoves is provided by the prison.