In a large pan, mix sugar, cornstarch, cinnamon, and nutmeg. Add salt and water and mix well. Bring to a boil and cook until thick and bubbly. Remove from heat and add lemon juice and food coloring.
Sterilize canning jars, lids, and rings by boiling them in a large pot of water.
Peel, core, and slice apples. Pack the sliced apples into hot canning jars, leaving a 1/2 inch headspace.
Fill jars with hot syrup, and gently remove air bubbles with a knife.
Put lids on and process in a water bath canner for 20 minutes.
