Creating a Vegetable Garden in Madrid

Does anyone know of any neighborhoods in Madrid where it would be plausible to create a vegetable garden? I am considering moving to Madrid but being able to work the earth is important to me. I am concerned that it might not be realistic to find a place where I could plant a decent size garden.

Thanks!

Did you think about looking around the city on google earth ?   

You should be able to see where there are more open spaces then you could ask about specific locations