HINTS: There are lots of crabapple trees around these days. Some have lovely bright red fruit and others have pink or yellow fruit. The yellow fruit make the most flavorful jelly. The red fruit make the prettiest jelly. I suggest if you can find them, you mix the different colors.
If you have leftover juice, save it. The juice is excellent added to grape, elderberry or peach plum juice for another batch of jelly. If you are a little short of the amount of juice you need for a batch, you can add a little water (not more than 3/4 cup). Do not try to double this recipe. It won't work.