- In a large, non-reactive bowl, whip the egg whites into foam.  Set aside. 
- In a large mixing bowl, sift together flour, baking powder, salt, sugar. 
- Stir in dashi, sesame oil, chopped pickled chanterelles, scallion greens, egg yolks, mix thoroughly. 
- Gently fold in whipped egg whites - just enough to incorporate. 
- Preheat a skillet or griddle with a tablespoon of vegetable oil (if you have a griddle, it makes these a lot easier to make as you can do more than one at a time). 
- Place a fairly large handful of cabbage (see note) and ~3/4 cup batter in the center of the skillet/griddle over medium heat and flatten a little with a spatula (see note on thickness below). 
- Lay a few strips of smoked salmon on top of the okonomiyaki, then cover the pan (or put a pot lid over the individual okonomiyaki if you're using a griddle).  Cook for about 3-4 minutes. 
- Flip and cook uncovered for an additional 2-3 minutes.  Cool slightly, then add okonomiyaki sauce, mayo, and any other desired toppings. 
- Repeat steps 5-8 above with remaining batter, cabbage, and toppings.  Best served immediately, as each individual pancake is ready.