Here's a skillet supper that is ready in about an hour, making it ideal for busy weeknight meals. It's also decidedly different, in the best way: First sliced potatoes are cooked until browned, and then onion, garlic, apple, cider vinegar, and tomato sauce are simmered together before being pureed to form a sauce. Finally, the fish and those potatoes are simmered in the sauce (using the same skillet), meaning cleanup is a cinch.