Cook cider over high heat, uncovered, about 30 minutes or until it is reduced
Wash, quarter and core unpeeled apples. Add to cider, and cook over low heat
until very tender. Stir frequently. Work apple mixture through a sieve, returning
the puree to the kettle. Stir in sugar, all the spices, and salt. Cook over very
low heat, stirring almost continuously, until mixture thickens.