As a girl, my mother would make pickled beets for me, because I love them. We grew our own beets in the yard. As an adult I still love pickled beets, and I am particular about how sweet or tangy they ought to be. I don’t like them to be too sweet, which is what many canned beets can be. You note that this doesn’t indicate how many beets are required. Take a guess, it’s probably a lot. Also, slice the beets into 1/4″ thick slices or just a smidge less. The pickling flavors will saturate the meat of the slice better.
Pickled Red Beets
3 quarts water
5 cups sugar
1 quart vinegar
1 c canning salt
Bring to a boil. Pour over red beets. Seal.