Wikipedia-sama said.So if you don't want or like pork, you can do it without :)The name is derived from the word okonomi, meaning "what you like" or "what you want", and yaki meaning "grilled" or "cooked"
The thing that holds it all together is the batter (flour mix with dashi if I recall correctly).
Then you add chopped cabbage (and maybe that's another ingredient you can't do without) and then.... stuff you like !
http://japanesefood.about.com/od/hol...konomiyaki.htm this recipe seems pretty accurate.
You can replace the pork with kimchi, vegetable, prawns, whatever you want~