The jelly or the instructions.
First of all wash and cut the blossom and stem ends from about 2 kg. or 4.5 pounds of crabapples, about 5 cups. Cut the apples roughly into about quarters and put in a big deep pot with 7 cups of water. Boil until they are real mushy about 50 minutes or so.
Put the mushy apples into a jelly bag and hang over night.
I filmed this last step sideways for interest.