Zest and juice the lemon. Add the lemon juice to the evaporated milk and stir. Let it sit for a few minutes to thicken.
In a large bowl, combine the cake flour, salt, baking powder, and sugar. Add the egg, vanilla, and the lemon zest to the evaporated milk. Whisk to blend.
Slowly blend the wet mixture into the dry ingredients, stirring gently. Fold in the blueberries and the melted butter.
Heat a nonstick griddle or skillet over medium-low heat. Grease the pan with butter or nonstick cooking spray.
Pour the batter onto the cooking surface by 1/4 cupfuls. Cook until golden brown on both sides. Flip the pancakes when bubbles rise to the surface.
Serve warm with additional butter and syrup. Enjoy!