Baked Salmon and Pesto Parcels

We had the cod-and-herbs variant for dinner yesterday, and it was quite nice, similar to the Salmon en Papillote with Watercress Sauce we had recently. Unfortunately, though, the cooking time isn't correct - we only cooked the cod for 13 instead of 15 minutes, and it still was horribly overcooked. Also, it's a bit simple; I added a shallot, but even then it may have a little something extra for adults - a sauce, maybe? But then again this just may be me; maybe this book is written for people who are perfectly happy for a recipe as simple as this one.