In shallow dish or pie plate, beat egg with wire whisk. In another shallow dish or pie plate, place bread crumbs.
In 12-inch skillet, heat oil over medium heat. Dip fish into egg, then coat with bread crumbs; place in skillet. Cook 8 to 10 minutes, turning once, until browned on both sides and fish flakes easily with fork.
In small bowl, mix tartar sauce, tomato and basil; serve with fish.