Wash your potatoes and peel them.
Grate the potatoes and place them in a large bowl.
Pour warm water until you cover all the grated potatoes.
Swirl the grated potatoes while soaked in warm water.
Place your strainer on top of another large bowl. If your strainer doesn’t have fine mesh, place cheesecloth over it.
Pour water into your strainer.
Using your hands, squeeze the potatoes to extract the remaining water and pour that water into the strainer.
Repeat steps 3 to 7 until you have clear water and you see starch at the bottom of the bowl.
Add warm water to the bowl containing the strained water and starch to release the starch from bowl’s bottom.
Slowly scrape the potato starch using a spoon from the bowl and place it on parchment paper.
Allow to dry overnight, or place it in your oven set at low heat.
Once dry, place it in your coffee or spice grinder and pulse until you have a fine powder.
Transfer to a jar and seal tightly.