Sloppy Joe Sliders

In a large skillet, brown ground beef (bread it up well). Drain grease from beef. In a small bowl, mix lemon juice and cornstarch until smooth. Add onion,brown sugar, tomato sauce, Worcestershire sauce, mustard, and salt. Mix well and add to skillet. Cook over medium heat, stirring occasionally until the sauce has thickened. Split sandwich buns and spoon mixture onto buns. Top with pickles if desired.