|(Photo credit: @Doug88888)|
In the UK this meat is typically sold frozen in discount or bargain lines. Here in the UAE you can find a similar product as 'frozen' or 'marinated' chicken breast. It's not a marinade I'd choose to consume, I can tell you. These pumped breasts can contain anything up to 50% water. Bargain!
Hydrolised meat protein is extracted from bones, skins and other scraps of cows and, where permissible, pigs. This is accomplished using acid to break the meat down into its component amino acids. When it comes into contact with food, hydrolised protein naturally forms MSG or monosodium glutamate - so that watery chicken breast also packs an (unlabelled!) MSG punch.
So there's horse in your beef and beef in your chicken! Yum!