In a medium bowl, sift together the flour, baking powder, baking soda, salt, cornmeal and sugar; set aside.
In a small bowl, mix together the milk and lemon juice; add to the dry ingredients along with the egg yolks, lemon zest, vanilla extract and melted butter.
Stir together slightly with a wooden spoon, only enough to just form a batter; lumps are a good thing in pancake batter.
In a small bowl, beat 2 egg whites until soft peaks form; fold gently into the batter.
Pour batter, by ¼ cup measures, on a pre-heated oiled griddle pan, on medium heat, or 375°F on an electric griddle pan.
Sprinkle each pancake with blueberries.
When bubbles start to break the surface of the pancake, it is time to flip them and cook for about another 2 minutes or until golden brown.