Use a pair of chopsticks to stir together the flour and salt in a large bowl. Slowly add ½ cup of water, stirring until the mixture comes together into a shaggy dough. Turn the dough out onto a clean work surface and knead until the dough is smooth, elastic, and not at all sticky, about 20 minutes. If the dough is too dry, add water, a teaspoon at a time. Alternatively, you can use a dough hook and a stand mixer on low speed.
Form the dough into a ball and wrap it in lightly oiled plastic wrap. Let it rest at room temperature for at least 2 hours and up to 24 hours. (It’s best if you can make this the day before and let it rest overnight—the dough will have lots of hands-off time to develop gluten, making the noodles thick and chewy.)
When you’re ready to pull the noodles, lightly oil the dough and divide it into halves. Cover one portion with plastic wrap while you work with the other one. Lightly oil your work surface and a tray. Place the dough on the work surface and roll it into a rectangle about ¼ inch thick. Use a knife to cut it into 1-inch-wide strips. Cover the strips with plastic wrap.
Working with one dough strip at a time, use the heel of your hand to flatten it into a very wide, long strip, then take hold of both ends of the strip and bang it against the oiled work surface, pulling your hands apart slowly so that you’re stretching the dough. There’s no trick to pulling the noodles—as long as your dough has rested enough and you slowly stretch out your hands, the dough will comply. Pull until the noodle is 20 to 24 inches long and about ⅛ inch thick. Lay the noodle on your prepared tray (you may need to snake the noodle to fit) and cover with plastic wrap so it doesn’t dry out. Repeat with the remaining dough until it is used up.
Bring a large pot of water to a boil over high heat. Add the noodles and stir gently so they don’t stick to each other or the bottom of the pot. Cook until tender, chewy, and cooked through, 4 to 5 minutes. Drain well.
To serve, toss the noodles with the sauce of your choice, and enjoy.