Why is this supposed to upset me? If we're going to keep eating animals (and that sure is my plan), we shouldn't give ourselves the luxury of getting squicked out over using the whole animal. If you're picky about what's in your ground beef, find a butcher you trust, or grind your own.
>Why is this supposed to upset me? The factor that dominates our conversations about food - social class. We have a set of reflexive attitudes about food that are largely uncorrelated with health, nutrition or the environment, but are strongly correlated with the social class of who eats what. Advanced meat recovery is the ultimate in nose-to-tail eating, allowing us to make use of almost every gram of edible meat on…
It's connective tissue, with a bit of lean beef mixed in. This has a different nutritional profile. There is less iron, and the amino acid proportions are different.
We could call it "pureed tendons, ligaments, defatted fat tissue, cartilage, lean beef, and ammonia or citric acid". That is a long and unwieldy name. The common name, known to consumers, is pink slime.