In 2-quart saucepan, mix apples, brown sugar, water and lemon juice. Heat to boiling; reduce heat. Cover and simmer 7 to 8 minutes or just until apples are tender. In small bowl, mix 1/4 cup flour, the granulated sugar and 3/4 teaspoon salt; stir into apple mixture. Cook, stirring constantly, until mixture thickens and boils. Boil and stir 1 minute; remove from heat. Stir in vanilla and butter; cool.