Step 1

Preheat the oven to 250 °F (120°C) and line a small baking sheet with aluminum foil. Spread the baking powder on the baking sheet and bake for about 1 hour. Let cool, and transfer the baked baking soda to a small container. You can then store the baking soda for months and use it when needed

Step 2

To make the alkaline water for one batch of noodles: dissolve 1/4 tsp of the baked baking soda in 1 teaspoon of water.

Step 3

Make the dough: Add the flour, alkaline water, salt, and 3/4 of the water to the bowl of a stand mixer fitted with the paddle attachment. Knead on low-medium for about 1 minute or until it forms a sandy texture. Slowly pour in the rest of the water and knead until it forms a coarse texture. Test the dough by pressing it between your hands. It should be dry but soft enough to hold together into a ball.

Step 4

Let it rest: Cover with plastic wrap to touch and let the dough rest for 45-60 minutes at room temperature.

Step 5

Roll the dough: Divide the dough into 6 even pieces. Using a pastry roller, slightly flatten one piece into a small rectangle of a ½-inch thickness.

Step 6

Using a pasta maker or a Kitchenaid fitted with the pasta roller attachment, run the dough through the widest setting. Repeat this step 3-4 times or until the dough is smooth.

Step 7

Decrease the thickness setting of your pasta roller to your desired thickness (I used setting 2 on my Kitchenaid pasta roller) and run the dough another 2-3 times. Dust your pasta sheet with cornstarch and repeat with the remaining pieces of dough.

Step 8

Cut the noodles: Working with one at a time, run a pasta sheet through the spaghetti cutter attachment and toss the noodles with cornstarch. Transfer the noodles to a container and repeat with the remaining sheets of dough.

Step 9

Let the noodles rest for at least 1 day in the refrigerator, in an airtight container.

Step 10

Cook the noodles: Bring a large pot of water to a boil. Once boiling, add the noodles and cook for about 2 minutes or until just tender. Drain and rinse the noodles once under cold water to stop the cooking process.

Step 11

Use these noodles in ramen, stir-fries, or cold noodle salads!