Fill a canning pot with water and heat to boiling. Set aside 3 quart jars or 6 pint jars, lids, and rings.
Fill a large pot with water and heat to boiling. Blanch apple slices in 2 batches, cooking for 1 minute per batch. Remove to a bowl and cover to keep warm.
12 cups peeled, cored, and sliced apples
Pour out water from the pot you just used and refill with cold water, sugar, Clear Jel, and spices. Whisking constantly, heat over medium-high and cook until bubbles begin to form. Break up any clumps using the back of a wooden spoon. Add lemon juice and boil for 1 minute.
Ladle into hot jars, leaving a 1-inch headspace. Remove air bubbles with a wooden or plastic stick (do NOT use a metal utensil). Wipe off any spilled filling, giving special attention to the jar rims. Place lids, screw on bands, and process in a water-bath canner for 25 minutes.
Notes
Place sliced raw apples in a mixture of 4 cups water and ¼ cup lemon juice to prevent browning while preparing recipe.