Preheat the oven to 350?F (175?C). In a mixing bowl, combine flour, sugar, butter, and salt. Mix until crumbly.

Press the mixture into the bottom of a greased 9x9 inch baking pan.

Bake for 10 minutes, then remove from the oven.

In a saucepan over medium heat, combine cherries, sugar, cornstarch, vanilla extract, and lemon juice.

Cook until the mixture thickens and starts to bubble, about 5-7 minutes.

Pour the cherry filling over the pre-baked crust, spreading it evenly.

Bake for an additional 20 minutes or until the filling is bubbly and the edges are golden.

Allow to cool before slicing into bars.