If you're just looking to fill jars and it doesn't have to be pickled: apple sauce and apple butter. Wait for apples to be in season and cheap at the store, then core cut up and cook down. Add a little bit of cinnamon, and maybe a tiny bit of sugar if it needs. Stop cooking when it looks like applesauce, or keep cooking off more moisture and until you get apple butter.
If you're just looking to fill jars and it doesn't have to be pickled: apple sauce and apple butter. Wait for apples to be in season and cheap at the store, then core cut up and cook down. Add a little bit of cinnamon, and maybe a tiny bit of sugar if it needs. Stop cooking when it looks like applesauce, or keep cooking off more moisture and until you get apple butter.