Two Things: a Micro-rant

1. If you buy a beef product, you can reasonably expect that it does, indeed, contain beef. And, more importantly, not pig, horse, rabbit, or other meat (unless it specifically says so). It is, therefore, entirely reasonable to be angry about this. And that applies even if it's right at the bottom of the budget range.
2. That said, horse is good eating. Our aversion to it is entirely cultural. I ate it in France, and very nice it was too. In fact, had I not been told, I would never have distinguished it from beef. So there's no need to worry about these particular products.