Step 1: Mix the flour, sugar, vanilla sugar, and yeast until smooth.
Step 2: Melt the butter and add it to the flour with the lemon zest, milk, and rum. Mix well until a dough is obtained.
Step 3: Let the dough rest for 30 minutes.
Step 4:  Roll out the dough and cut it into 8 cm and 3 cm strips.
Step 5: Fry the dough in hot oil, drain and sprinkle with powdered sugar.

The chef´s special touch:
You can garnish your french doughnut with jam for more deliciousness and you can replace the rum with orange blossom essence.