How to develop a recipes application

I can develop android applications. I want to develop a recipes application. Users will select ingredients they have. The application will suggest food and desserts recipes which can be made with the selected ingredients. In order to do this, my application should search the selected ingredients at Web, and return some results. I don't know where to retrieve results from and how can i develop such an app and what i need to do such an application? Please guide me..
Thanks in advance.

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