Recs.
Updated
Paprika ($4.99) is a helper for all things food related. In addition to recipes, Paprika gives users access to grocery lists and food planning.
Specs
Pros
Pro Has tools for planning out meals weeks in advance
Paprika has a simple to use meal planner that allows adding recipes along with notes to a calendar. This information can later be used to automatically create a grocery list. Meal plans last forever. Want to know what you served for Christmas 3 years ago? It's there.
Pro Can import recipes from a wide variety of online sources
Covers most of the major websites, including Food & Wine, Food Network and The Girl Who Ate Everything and even a good amount of "unsupported" websites will work.
Pro Can generate a grocery list
Depending on meal plans, Paprika can create a grocery list with all required ingredients. In the grocery list it's possible to view ingredients grouped based on recipes or all together. It can even keep a list of items already available and skip those when creating a grocery list.
Pro Simple, clean interface
A lot of time has been spent on making the interface feel as intuitive as possible. Navigation is easy, it's possible to highlight items with taps to track what steps have been taken or tap to cross-out ingredients that have been added as well as adjust the recipe easily without overwriting the original and make notes of changes and preferences.