This is some weed covered Eggplant, Ichiban, it's much easier to grow than normal and does not get attacked by bugs as much as the purple, for me at least and taste the same.
I like to peel it and slice long ways then run through eggs then bread with Italian bread crumbs and fry, I can't cook enough of this either it disappears also, If I don't get it first !
We cooked about 25 of them so far and they still seem to be making flowers so if they keep producing I will keep eating them ! 
That's about all we planted this year, I do plan on taking out the old Chicken coup and making that whole space a garden next year.
http://www.ehow.com/how_4443900_grow-ichiban-eggplants.html