In 1877 the first shipload of frozen beef was carried from Argentina to France.
At Waitrose, a spokeswoman said it had had "contradictory results" from tests on the frozen beef meatballs.
But bacteria on the surface of cuts of frozen beef are almost always killed by cooking, she said.
German supermarket chain Real confirmed Wednesday that samples of a frozen beef lasagna had tested positive for horse meat.
Some Findus frozen beef in lasagne, made by a French food processing company, was found to be up to 100% horsemeat.
They advised them to remove Findus Beef Lasagne and Aldi's Today's Special Frozen Beef Lasagne and Today's Special Frozen Spaghetti Bolognese.
Three major supermarkets have cancelled contracts for frozen beef burgers with Silvercrest.
BBC: Horsemeat row: Trade union's fears over Silvercrest jobs
Scotland's councils have been told not to use any frozen beef products following the discovery of horse DNA in a school canteen burger.
One of the latest cases involved the brand Findus, which last week revealed that some of its frozen beef lasagne dishes were actually 100% horsemeat.
Last week Findus UK took its frozen beef lasagne, made by Comigel, off the shelves after some were found to have up to 100% horsemeat in them.
The food giant has already withdrawn ready meals in France and Sweden after it emerged that its frozen beef lasagne sold in Britain contained up to 100% horsemeat.
It tested frozen beef burgers taken from store shelves and found that more than a third of brands at five supermarkets contained at least a trace of horse.
Six French supermarket chains have withdrawn frozen beef meals made by Findus and Comigel after it emerged some beef-labelled foods sold in Europe and the UK contained horsemeat.
They included its Tesco Everyday Value 8 x Frozen Beef Burgers (397g), Tesco 4 x Frozen Beef Quarter Pounders (454g) and a branded product, Flamehouse Frozen Chargrilled Quarter Pounders.
Swedish food giant Findus withdrew ready meals in France and Sweden on Friday after it emerged that its frozen beef lasagne sold in Britain contained up to 100% horsemeat.
In Scotland, councils have been told not to use any frozen beef products following the discovery of horse DNA in a burger at Cumbernauld High School in North Lanarkshire.
Last week Findus UK took its frozen beef lasagne, made by the Comigel food processing company in France, off the shelves after some were found to have up to 100% horsemeat in them.
London (CNN) -- A scandal over horsemeat found in frozen beef products is spiraling across Europe as several governments launch investigations and a company involved says it has determined who "the villain" is.
CNN: Horsemeat found in beef products, search on for 'villain'
Tesco confirmed the products affected were its Tesco Everyday Value 8 x Frozen Beef Burgers (397g), Tesco 4 x Frozen Beef Quarter Pounders (454g) and a branded product, Flamehouse Frozen Chargrilled Quarter Pounders.
You can freeze them when you get them, and I eat frozen beef all the time, but if you plan to make it on arrival day, as I did, you simply cannot get it any fresher.
The scandal began in January when Irish food inspectors announced that they had found horsemeat in frozen beef burgers made by firms in Ireland and the UK, and sold by a number of UK supermarket chains, including Tesco, Iceland, Aldi and Lidl.
On 8 March, 3663 recalled all batches of this frozen mince beef product.
The firm said it had issued a notice withdrawing frozen minced beef produced from 12 December to 17 January.
Newport-based Welsh Bros Food contacted Sandwell Council on Wednesday to report one batch of frozen minced beef had "potentially tested positive".
Northamptonshire County Council said it took the precautionary measure when horsemeat was detected in one of 10 tests on frozen minced beef.
The council carried out tests on all the frozen processed beef products it provides to schools following the discovery of horse DNA in the cottage pies.
BBC: Horse DNA found in halal burgers for Lancashire schools
In the UK, three Aldi burger products - frozen Oakhurst 100% beef quarterpounders, frozen specially-selected Aberdeen Angus quarterpounders and frozen Oakhurst beefburgers (16 pack) - were withdrawn when the horsemeat discovery was made public.
Traces of horsemeat have been found in numerous processed beef frozen meals across Europe.
BBC: Horsemeat scandal: Dutch uncover large-scale meat fraud
Instead of a bottle of water, how about knocking down walls with a frozen slab of beef?
FORBES: Wacky Weapons #1: Water Cooler Bombs Blow Holes in Walls
He said Castell Howell has around forty suppliers of frozen ready meal products containing beef.
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