Start with approximately 20 pounds of fresh apples free of blemishes and bruises. Minor blemishing can be cut out but always make sure you are using high quality fruit.
Have ready a large water bath canning kettle, pint sized canning jars with brand new lids. You will also want a canning jar lifter and a candy thermometer.
Peel and core the apples. Because it will take a while to get all the apples peeled have a large pan with about 1 gallon of water with 3/4 cup lemon juice in it. Put the apple slices in the lemon water as you work to prevent browning of the fruit. After peeling, slice the apples.
Once all fruit is peeled and sliced drain it from the lemon water and add it to a large stock pot and heat on the stove over medium heat. Cover the stock pot, but check frequently to make sure that the fruit is not scorching on the bottom. Water will soon start cooking out of the fruit and this will protect against scorching after the first few minutes. Keep the pot covered so that the fruit simmers and steams. Check every couple minutes and stir the fruit. Depending on the firmness of the apple variety you selected, the apples should become noticeably softened in about 20 or 30 minutes. Once apples are softened and beginning to break apart when stirred, start mashing them with a potato masher. This speeds the saucing process. You can make the apples as smooth or as chunky as you want. Keep the applesauce cooking after you mash to cook out more liquid. You don't want the applesauce runny. Cook out the water until a thick sauce forms. During this time, you may add sugar and spice if you want.
Add, if desired:
2 cups white sugar
1/2 cup cinnamon
2 tablespoons cloves
1 tablespoon nutmeg
dash of salt
While you are cooking the apples, get the water bath canner and the jars ready. Wash your jars, and bands and fill the canner. Heat the water in the canner to at least 180 degrees F but less than boiling and submerge the jars completely. Use the candy thermometer to monitor water temperature. After the jars have been sterilizing for a couple minutes, shut off the heat to the canner and cover it. The water and jars will stay hot while you're finishing the applesauce.
Once the applesauce achieves a thick consistency without any puddles of excess liquid, remove from heat. Take the sterilized jars and lids out of the water and fill with applesauce. Leave 1/2 inch headspace in jars. Carefully clean and wipe dry the rims of the jars and put on the lids. Secure the lids with the jar bands and screw tight with your hand. You don't have to make it really tight. Just screw it on without forcing it.
Bring the water in the canner to a full boil and carefully add the filled jars with the jar lifter. Make sure at least 1 or 2 inches of water are above the tops of the jars. Keeping the water at a boil, process the pints for 25 minutes.
When processing time has elapsed, remove jars from water and place on a towel in a draft-free location. Do not disturb the jars for 12 to 24 hours while the seals cool and tighten. You may hear the lids pop down and make a seal within the first few minutes, but do not touch them.
The next day, remove the bands, wipe the jars and lids clean and store in a cool dark place for up to one year.