It’s individual portions of meat and fish, sometimes pre-seasoned, stuffed, or otherwise prepared.
This is in addition to the packages of single-serve prepared meals in various display cases around the store, as well as small packages of prepared vegetables in the produce section.
I’ve even seen individual potatoes wrapped in plastic!
Grocers and food producers are using clever marketing strategies to cater to single people and small households, a large demographic in this country.
Now, you typically pay a substantial premium for smaller packages of just about anything, just as you do for even the tiniest bit of labor that goes into any food prep. And I'd be willing to bet that mark-up in price accounts for the shelf space these items are increasingly taking up.