Soften gelatin in cold water.
Boil sugar and the 1/2 cup water slowly for 3 minutes, counting time after boiling starts.
Add salt and peeled, sliced apples (should be 3 cups) ; cover, simmer until tender.
Remove from heat, stir in gelatin, then lemon juice and rind; cool.
Pour into mold or bowl; chill until firm.
Unmold and serve with cold Custard Sauce or cream.