In a small bowl combine the raisins and rum.
Separate the eggs and set the egg yolks asideto use later.
In the bowl whisk the three egg whites using a whisk or whisk attachment of a mixer, beat at high speed for about 2.5 minutes until stiff peaks form. Don't overbeat the egg whites.
Set aside.
Add the three egg yolks, melted butter, vanilla extract, sugar, and a pinch of salt to a new bowl.
Whisk at medium speed about 2-3 minutes.
On low speed, alternately add flour and milk, a tablespoon of each at a time, until all the flour and milk are used up. Don't overmix. Scrape down the sides of the bowl as needed.
Using a metal spoon or rubber spatula, very gently fold in the stiff egg whites until combined and no big egg white lumps remain.
Heat 1 tbsp butter in a 12-inch skillet over medium heat.
Pour the batter into the skillet.
After 3 minutes sprinkle the drained raisins over the batter.
Check to see if the underside is golden brown. When it is, sprinkle the top with a little bit of sugar.
Using a spatula, divide the pancake into quarters then turn the pieces over. Add a little butter to the pan while turning the pancake.
Cook for 3-4 minutes until the quarters are golden brown underneath.
Using two spatulas, tear the pancake into bite-sized pieces.
Add 2 tbsp butter and sprinkle 2 tbsp sugar over the pancake pieces.
Turn the heat up to medium-high and gently toss the pieces around with a spatula for about 3-4 minutes, until the sugar has caramelized.
Sprinkle with confectioners' sugar and serve with applesauce on the side.