How to Make It
In a large nonstick skillet, melt the butter. Add the apples, sugar and cinnamon and cook over moderate heat, stirring occasionally, until the apples are tender and the mixture is thickened, 8 to 10 minutes. Sprinkle in the cornstarch and simmer, stirring, for 1 minute. Remove the skillet from the heat and stir in the lemon juice. Scrape the filling into a medium bowl and let cool slightly before using or serving.