Environment Minister David Heath said the issue of horse DNA being found in beef burgers is "extremely serious".
"Consumers should have full confidence that food is exactly what it says on the label", Mr Heath said. "There are strict rules" requiring food to be labelled accurately, he added.
Mr Heath's came in response to an urgent question in the Commons asked by Shadow Environment Secretary Mary Creagh.
The horsemeat scandal demonstrates how long and complicated the food chain we all depend on is. Regulating our food supply is expensive.
Some of the best, and worst, jokes and gags from Twitter users discussing the discovery of horse DNA in some supermarket beef burgers.
We've seen the jokes on Twitter but the discovery of horse and pig DNA in beefburgers poses a serious question; where did it come from?