Recipe Database based on supply of ingredients.
An online recipes website, that allows you to search for recipes based on ingredients. Not main ingredients, like most recipe sites, but ALL ingredients.
In other words, I would log onto the site, enter in what I have in the fridge and in the cupboard (store the info in a database so I don't have to add it every time), and then look for what I can cook. I would only see recipes that I would be able to make at that moment with the ingredients I allready have.
Reward: Inform me about it.