Baking the baking powder (see note)
Scatter the baking powder on a baking tray lined with baking paper, bake for approx. 30 mins. in the centre of an oven preheated to 200°C. Remove from the oven, leave to cool, seal well.
Combine the water and 1½ tsp of the baked baking powder. Mix the flour and salt in a bowl. Add the water, mix into a crumbly mixture using the dough hook on a food processor for approx. 5 mins. on a low setting. Cover the bowl and leave to rest for approx. 30 mins. Knead for another 5 mins. or so, remove from the bowl and knead for a further 5 mins. or so by hand to create a soft dough. Cover the dough and leave to rest for approx. 30 mins.
Divide the dough in half, using the widest roller distance, pass through the roller several times, folding together again each time, cover and leave to rest for approx. 5 mins. Using the pasta maker, roll the dough out more and more thinly (until you reach around the third thinnest roller setting). Roll the sheets of dough through the spaghetti-maker of the pasta maker, or scatter with wheat starch, roll out, and cut into thin strips. Mix the ramen noodles with the wheat starch, leave to dry.