Fried Chicken with tomatoes

1 small red onion , halved and thinly sliced 1/2 cup red wine vinegar 2 tablespoons sugar 1 MAKE THE PICKLED ONION:. 2 Put the sliced red onion in a medium[...]

4 (6 ounce) boneless skinless chicken breasts 1 teaspoon salt 1/2 teaspoon pepper 1 large egg 1/4 cup all-purpose flour 2/3 cup Italian seasoned breadcrumbs 2[...]