Whisk the eggs with the milk and water. Add the flour and salt then stir everything with the whisk until smooth.
A little butter in a large nonstick frying pan. Pour batter into the frying pan so he base is covered. Immediately sprinkle some blueberries on it and cover. Once the pancake is set and brown on the bottom, turnover. Bake the other side. If you want to fold.
Cook the other pancakes as well then serve with cinnamon sugar or maple syrup.