Twisted Donuts (Kkwabaegi)

Steps

1. In a large bowl, combine lukewarm water, melted butter, sugar, and eggs, mixing well.
2. Add bread flour, tapioca flour, dry milk powder, instant yeast, and salt. Mix until a smooth, elastic dough forms.
3. Cover the dough and let it rise in a warm place until doubled in size, about 1 hour.
4. Punch down the risen dough and divide it into 20 equal portions.
5. Roll each portion into a long rope, then twist it into a spiral shape to form the donut.
6. Let the shaped donuts rest and rise again for about 20-30 minutes.
7. Heat oil in a deep pot or fryer to 325°F (165°C).
8. Fry the donuts in batches, turning occasionally, until golden brown on all sides, about 3-4 minutes per batch.
9. Remove donuts and drain excess oil on a paper towel-lined tray.
10. Mix sugar and cinnamon together in a bowl to make cinnamon sugar.
11. While donuts are still warm, roll them in the cinnamon sugar mixture until well coated.
12. Serve warm or at room temperature.