You can make 1 jar of this or a few or a dozen at a time according to what your needs or supplies are. Leaving the beets whole for cooking prevents them from bleeding out and losing their color. I have always used the brown malt vinegar for these since white malt vinegar is harder to find. The brown vinegar will darken the color of the beets a little. These are my favorite beet pickles, better than the sweet kind! I developed this recipe from experimenting with a combination of several old recipes I found in British cookbooks and adapted it to the by the jar method I discovered in Andrea Chesman's "Summer in a Jar" cookbook. Number of servings is my guess at how many might come from one jar and cook time is the approximate time for processing in a boiling water bath.