Core the apples and give them a rough chop.Place in slow cooker.Add cinnamon, water and both sugars.Gently stir.Close the lid and let this cook away for about 4½ hours on low.Check it periodicaly to make sure it is still moist and the apples are not dried out. Add more water as needed.Remove from Crock Pot after 4½ hours and place in a food processor or blender.Add a squeeze of lemon juice if you like.Puree until smooth.If the apple butter looks more like applesauce and doesn't have the rich brown color, just place back in the crock pot and cook for another hour or so on high heat. Leave the Crock uncovered and check it often.