You can drown a fish filet in a heavy sauce or fry it in too much fat. Or you can combine the mild flavors of yellow tomatoes and yellow bell peppers for a light coulis that does not overpower the delicate flavor of sole.
The sole is fried in nonstick cooking spray and just a bit of butter for flavor. Petrale sole is a member of the flounder family and has a firmness that makes it easy to fry without falling apart during cooking and turning.
Look for cans of golden plum tomatoes alongside regular canned tomatoes at the grocery store.