Prepare the Apple: Peel and grate the apple.

Add a splash of lime or lemon juice to prevent browning.

Make the Batter: In a mixing bowl, whisk the egg with sugar and vanilla sugar until combined.

Stir in yogurt and milk until the mixture is smooth.

Add baking powder, rum, and salt, and mix well.

Gradually add flour, stirring until the batter is smooth and lump-free.

Fold in the grated apple.

Let the batter rest for 10 minutes.

Cook the Pancakes: Heat a pan over medium heat and lightly oil it.

Spoon about 1 tablespoon of batter onto the pan for each pancake.

Cook until bubbles form on the surface and the edges are set.

Flip and cook until golden brown on the other side.

Serve: Serve the pancakes warm.