apple jam

here is a recipe for apple jam:

Ingredients:

4 pounds apples, peeled, cored, and chopped (about 12 cups)
5 cups sugar
1/4 cup lemon juice
1 cinnamon stick (optional)
Instructions:

Place a small plate in the freezer.
Combine the apples, sugar, and lemon juice in a large saucepan.
Bring to a boil over medium heat, stirring occasionally.
Reduce heat to low and simmer, stirring occasionally, for 30-45 minutes, or until the apples are soft and the jam has thickened.
Remove the cinnamon stick, if using.
To test for doneness, place a small amount of the jam on the cold plate. It should be slightly firm when cool.
If the jam is not yet thick enough, continue to simmer for a few more minutes.
Pour the jam into clean jars and seal tightly.
Let the jars cool completely before storing in a cool, dark place.