Coarsely chop the cabbage, and cut the green onion into thin rounds. Cut up the ham into 1 to 2 cm cubes. Beat the egg.
Put the ingredients marked ◎ into a bowl and mix together. Add the ingredients marked ◆, and mix together while adding the water in 2 to 3 batches.
When there are no lumps left in the batter, add the cabbage, green onion and ham and mix well.
Heat some oil in a frying pan and pour in the batter, ensuring that it doesn't spread out too much and get too thin. (If you like you can top the batter with slices of ham or pork.)
Cook over medium heat until brown on one side. Flip over in one go, put on a lid and steam-cook for 3 to 4 minutes. Done! Enjoy!
Addendum: If you're making a lot of okonomiyaki, you can cook them in a 200 °C oven fo 40 minutes. But they turn out better cooked in a frying pan.
I only use 1 egg to cut down on calories, but it's very nice with 3 eggs too. If you use 2 eggs you need a bit less water.
How to turn spaghetti into Chinese-style noodles in an instant; See Recipe ID: 896386. Okonomiyaki is delicious with stir fried noodles.
For Hiroshima-style okonomiyaki see: Recipe ID: 1231635, Easy and Quick: Hiroshima Style Okonomiyaki In A Frying Pan.
For parties, I recommend: Cake-Style Okonomiyaki - Recipe ID: 1331292.
Make a big okonomiyaki in the oven - Recipe ID: 1313595.
Story Behind this Recipe
I made this for a party at home. I've simplified the ingredients, using ingredients that are easy to get hold of overseas. My favorite is Hiroshima-style okonomiyaki, but I like Kansai-style okonomiyaki too. If you use the noodle as in Recipe ID: 896386, you'll have a Kansai-Hiroshima combination okonomiyaki. This is the creation of an okonomiyaki-loving Hiroshima native!
People from Japan, Germany, Australia an Argentina have praised this recipe! I have a lot of confidence in this batter recipe! If you add some tempura batter crumbs (tenkasu), konnyaku and squid tempura to the batter, it will be even more delicious.