Briton Ralph Hannah, an inspector with the Guinness World Records, certified the win after putting the giant meal -- enough to feed some 7,000 people -- on a scale.
The official weight: 837 kilograms (1,845 pounds), which nearly doubles the previous record.
Armed with shovel-sized spoons, 52 cooks toiled over an enormous wok built especially for the event in San Jose's recently inaugurated Chinatown.
Some 735 kilograms of rice were used, along with 200 kilograms of chicken, 120 kilograms of ham, 20 kilograms of Chinese sausage, hundreds of eggs and vast amounts of chopped vegetables.
The Chinese Association of Costa Rica came up with the idea for the giant meal, said Godwin Pang, who helped coordinate the event.
Pang said the Chinese community wanted to mark the Year of the Snake, which began on Sunday, with a big event.
Most Chinese residents in Costa Rica are in the restaurant business. Chinese restaurants can be found even in small towns across this Central American country of 4.7 million.
Hannah, the Guinness representative for Latin America, said this was the first time that Costa Rica enters the world record book.