Place the flour, sugar and salt in a large bowl and give them a quick stir.
Add the egg yolks, buttermilk, ricotta, vanilla, lemon zest and mix just until combined (don’t worry about the lumps).
In another bowl, whisk the egg whites and cream of tartar with an electric beater until stiff peaks form.
Add the blueberries and egg whites to the batter and fold the mixture together.
Cook on a medium/high griddle or pan that has been lightly coated with butter.
Ladle the batter onto the hot griddle or pan (I use approximately 1/3 cup of batter per pancake).
Allow to cook long enough for bubbles to appear on the tops of the pancakes before flipping them. Cook until golden brown.
Serve with warm maple syrup and a handful of fresh berries.