Start by slicing the vanilla bean lengthwise and scraping out the seeds with a small knife. Pour a small amount of the sugar onto the cutting board and use the knife to "mash" the vanilla seeds and sugar together. Mix in the rest of the sugar.
Mix your homemade vanilla sugar with flour in a bowl and add the eggs. Whisk it all together well until the batter is smooth.
Heat a frying pan (about 28 centimeters in diameter) and melt all the butter.
Gradually whisk the melted butter into the batter. Finally, whisk in the milk.
Pour an appropriate amount of batter onto the pan. Tilt the pan around so the batter spreads in a thin layer.
Cook the pancakes over fairly high heat on both sides. They should be light brown and nice.
