In a large bowl, combine sugar, cinnamon, cloves, and salt. Toss sugar mixture with apples until well-coated.

Fill a 5-quart crock pot with sugar-coated apples. Cover, and cook on high for 1 hour. Reduce heat to low, and cook, stirring occasionally, until thick and dark brown, 10 to 11 hours. Stir with whisk until desired smoothness is achieved.

Spoon into jars, leaving about 3/4-inch space at top. Cover and refrigerate.