A SUPERMARKET beef burger typically contains just 60-70pc beef; the rest will be fillers and binding agents such as meat proteins or soya, wheat rusk, seasoning and flavouring.
The imported 'beef' protein being investigated as the possible source of horse meat is a powdered product that is not produced in Ireland.
ABP food group said it comes from EU-approved suppliers and is technically beef, which has been dehydrated and pasteurised, then flash dried.
It has good texture and binding characteristics, but bears no relation to the 'pink slime' used in US burgers which generated controversy last year.
Celebrity chef Jamie Oliver led a campaign against this mechanically recovered meat – but it is banned in the EU.