A swivel-bladed vegetable peeler works well for removing the orange peel. Be sure to remove only the colored part of the peel - which contains the flavorful oils - and no more; the white pith is bitter.
8 servings (serving size: about 1 cup)
Combine all ingredients in a large saucepan. Bring to a boil; cover, reduce heat, and simmer 30 minutes. Strain the mixture through a fine sieve, and discard solids. Serve cider warm.