Peel, core and quarter the apples. In a medium saucepan, combine the apples, water, vanilla and lemon juice and bring to a boil. Cover and cook over moderately high heat, stirring occasionally, until the apples are tender, about 15 minutes. Let cool, then remove the vanilla bean and whisk until a chunky sauce forms.
The applesauce can be refrigerated for up to 1 week.