1. Add flour, salt and rice flour into a large bowl and stir well. Add hot water and stir with a rubber spatula. Then knead the dough by hand for about 1 to 2 minutes until it gets smooth. You can shape it into a ball.
2. Let the dough sit in the bowl for about 15 min, covered with a damp cloth.
3. Remove the bowl of your stand mixer and attach the pasta roller to it.
4. Take some of the dough (about 1/3), shape into an oval. Flatten it and dust it with flour on both sides.
5. Feed the dough through the pasta roller (setting 1 - thickest), at least 3 to 5 times or until the dough is smooth. Turn dial to the thickness setting 3 or 4 and run the dough through once or twice. Repeat (once or twice) at each following position until you reach setting 8. The target thickness really depends on your own preference. I like thin skin, so I roll it until setting 8 :)
6. Lay the rolled out sheet of dough on a cutting board and cut it out, using a circle cookie cutter (8~9cm diameter suggested). Dust the cut out wrappers with katakuriko/potato starch and set aside. Repeat as many times as you can.
Gather all the scrap dough, put it all together and re-roll it a few times until it becomes thin layers again.
1. Mix dry ingredients (plain flour, gluten flour, katakuriko/potato starch) in a bowl. Transfer to the "Philips Pasta Maker" equipped with the udon extrusion disc. Close lid.
2. Turn the machine on and set it for the quantity you're going to be making. Press Start.
3. Slowly pour water through the opening in the lid.
4. Udon dough will begin to form and udon noodle will come out within a few minutes (3 min). Cut the first udon noodles at about 10cm length and put them back in the machine's mixing tank. That's because the first soba is not smooth enough :-)
5. The noodles will be extruded. Now cut the udon every 30~35cm.
6. Toss the udon noodles with a little bit of flour or katakuriko/potato starch to prevent sticking.
7. Repeat until the machine stops or the dough is finished!