I'm going to use it for the high bush cranberries. Clean and cook the berries, then run that through the food mill and it takes out the skins, stems and the flat seeds, leaving a pulp that can be made into a syrup, jam, jelly, or cordial if you like.
Mostly I'd use it for tomatoes, it would take all the skin and seeds out, leaving a smooth sauce. I've heard you can use them on potatoes to almost rice them and take out the skins.
I used to have currant bushes, could have used it for that.
There are three sets of 'strainer/blades' that it comes with depending on how fine you want to strain it.