Combine flour and salt in a medium bowl; cut in butter and shortening with a pastry blender until mixture is crumbly. Sprinkle milk, one tablespoon at a time, evenly over the surface; stir with a fork until dry ingredients are moistened.
Shape into a ball, roll pastry to 1/8 inch thickness on a lightly floured surface. Cut dough into 6, 5 inch circles; fit into 6, 4 inch tart pans with removable bottoms. Prick bottoms of tart shells with a fork, place on a baking sheet. Bake for 10 minutes at 450 degrees, or until golden brown. Cool completely.
Saute apples in melted butter in a large non stick skillet, 5 minutes; gently stir in brown sugar. Cook, stirring often over medium-high heat 4 to 5 minutes or until sugar is syrupy and apples are tender, yet retain their shape. Remove from heat, let cool.
Spoon apple mixture into prepared tart shells, sprinkly with blueberries and serve immediately.
If you don't want to cook, try our Wildberry or Apple Crisp.