Tried and True otherwise known as TNT.

5 Pounds assorted apples
2 Tablespoons Cinnamon
1 Cup Water

Wash off pesticides from apples with cold water and a fruit brush
Peel, Core, and Slice apples
Place into Large Pot simmering over medium high heat with a cup of water and cinnamon, then cover.

After five to ten minutes, check on the apples. If they are soft all the way through, they're done.
If you like chunky applesauce, mash with a potato masher, if you prefer smooth, slide into blender and puree. Add sugar if necessary, but most apples are sweet enough.
Pour into a dish and serve!
Homemade Applesauce is best served warm, but can be preserved in the fridge for up to a week.