Console-based Recipe Book

Establish the project foundation and define the core data models. This step involves setting up the C# console project and creating the classes that will represent the fundamental objects of our application: Recipes and Ingredients.

Develop the business logic layer. This involves creating a manager class that will be responsible for handling all operations related to the recipe collection, such as adding, retrieving, and deleting recipes.

Build the user-facing part of the application. This step focuses on creating a clean, interactive command-line interface that allows the user to navigate through menus and perform basic recipe operations.

Implement a mechanism to save the recipe book to a file upon closing the application and load it back when the application starts. This ensures that user data is not lost between sessions.

Enhance the application with powerful search capabilities. Users should be able to find recipes not just by title, but also by the ingredients they contain, making the recipe book much more useful.

Add advanced functionality to make the application portfolio-worthy. This includes allowing users to edit existing recipes, assign categories and ratings, and a 'killer feature': scaling ingredient quantities for different serving sizes.

Make the application robust by systematically handling potential user errors, invalid input, and file system issues. This step also involves organizing the code for better readability and maintainability.

Introduce a professional software development practice: unit testing. This involves creating a separate project to write automated tests that verify the correctness of your application's logic, ensuring that future changes don't break existing functionality.