Step 4: Heat a large, flat skillet or griddle. Evenly spread 1 tablespoon of vegetable oil on the surface. Take your okonomiyaki batter and spread it in a circle that is about 6 inches across and 3/4 inch thick. You will get several okonomiyaki servings out of your batter, so don't use all the batter at once. Remember, you have to flip this like a pancake, so don't make it so big that your pancake turner can't handle it.