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Mix together the flour, caster sugar and ½ tsp salt in a large bowl (see tip). Dissolve the yeast and a pinch of sugar in 1 tbsp warm water, then add it to the flour with the milk, sunflower oil, rice vinegar and 200ml water. Mix into a dough, adding a little extra water if needed.
Tip the dough onto a lightly floured work surface and knead for 10-15 mins, or until smooth. Put in a lightly oiled bowl, cover with a damp cloth and leave to rise for 2 hrs, or until doubled in size.
Tip the dough out onto a clean work surface and punch it down. Flatten the dough with your hands, then sprinkle over the baking powder and knead for 5 mins.
Roll out the dough into a long sausage shape, about 3cm thick, then cut into pieces that are about 3cm wide – you should have 18. In the palm of your hand, roll each piece of dough into a ball and leave to rest for 2-3 mins.
Use a rolling pin to roll out each ball, one by one, into an oval shape about 3-4mm thick. Rub the surface of the dough ovals with oil and brush a little oil over a chopstick. Place the oiled chopstick in the centre of each oval. Fold the dough over the chopstick, then slowly pull out the chopstick.
Cut 18 squares of baking parchment and put a bun on each. Transfer to a baking tray, cover with a clean tea towel and leave to prove in a warm place for 1 hr 30 mins, or until doubled in size.