1. Place bacon in a large, deep skillet. Cook over medium high heat until evenly brown. Drain, crumble and set aside.
2. In a medium bowl, whisk together the sugar, cornstarch and salt, and slowly pour in water and vinegar, whisking constantly.
3. In a medium skillet, add the crumbled bacon and pour the vinegar mixture over it. Cook over medium heat, stirring constantly, until mixture thickens.