01 -
Combine instant yeast with warm water and let sit for 10 minutes until foamy.
02 -
In a stand mixer, combine flour, sugar, and salt. Gradually mix in the yeast mixture.
03 -
Add eggs to the dough one at a time, mixing thoroughly after each addition.
04 -
Mix in room temperature butter, lemon zest, and vanilla extract (if using). Knead until smooth and elastic.
05 -
Let the dough rest by refrigerating it overnight or leaving it at room temperature until doubled in size.
06 -
Divide risen dough into equal parts and roll into small buns using your hands.
07 -
Place shaped buns on parchment-lined trays, cover, and allow to rise again until doubled in size.
08 -
Heat oil in a deep fryer or pot to 175°C/350°F. Fry doughnuts in small batches for 2 minutes per side until golden brown. Drain on paper towels.
09 -
Heat milk in a saucepan until hot but not boiling. In a bowl, whisk egg yolks, sugar, and cornstarch. Gradually add hot milk to the egg mixture while whisking. Return to saucepan and cook on medium heat until thickened. Stir in butter and let cool. Transfer to a piping bag.
10 -
Pipe cooled pastry cream into fried doughnuts through a small hole.
11 -
Caramelize sugar using a kitchen torch or the wet caramel method (melting sugar with water until golden brown).
12 -
Dip each doughnut into the caramel mixture and let the caramel harden to form a crunchy layer.
13 -
Garnish as desired and serve the crème brûlée doughnuts while fresh.