However this has since been beaten .
The Guinness Book of World Records reported that the biggest onion ever , at 14 lb ( 6.4 kg ) , was grown in Silsden in 2010 by Vincent Throup .
This has since been beaten .
The Guinness Book of World Records reported that the biggest onion ever , at 14 lb ( 6.4 kg ) , was grown in Silsden in 2010 by Vincent Throup .