Tesco's Group Technical Director Tim Smith said the supermarket was "appalled" over the burgers that contained 29% horsemeat and they took "full responsibility" for the error.
Mr Smith told the Commons Environment Committee that the supermarket would "continue to investigate as though Tesco and not the supplier was responsible."
More top news
Two Irish men have been killed while working on a building site in Australia where an apartment complex was being built.
A summary of the key announcements from Chancellor George Osborne's Autumn Statement and Spending Review.
All cuts have consequences, warns Joel Hills, as he examines which assets may be up for sale if George Osborne decides 'everything must go'.