An important question: Is potato starch and potato starch flour the same thing? No, potato starch (flour) and potato flour are different products used for different reasons.
Potato Starch (flour)
Potato starch is a very fine flour with a bland taste. It is made by removing the potato peel, then into a slurry and watery mix, then dehydrated to form potato starch. The potato starch is not cooked, so it does not absorb much water unless it is heated. For example- it will make an excellent gravy if heated with liquid in a saucepan.
Potato Flour
Potato flour is heavy, with a definite potato flavor and made from the actual potato, including the potato skin. It will absorb large amounts of water because it has been cooked and contains the peel. It is not used as a main flour in baking because it would absorb too much liquid and make the product gummy. Small amounts are used to increase water, hold product together and so on.
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