I've used potato starch in different things and to me it's an overrated item. It's expensive and the flavour can be quickly neutered by the next ingredient. Just my thoughts, but, by all means, it's worth trying. I could be trying to do the wrong thing with it.
Aurora, just FYI - ARGO and Kingsford's Corn Starch are also certified kosher. This would certainly be a cheaper, and available just about everywhere, alternative to Potato Starch for use as a thickener.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain
I make potato dumplings with potato flour. Just mix baked,mashed potatoes (still warm) with the flour , make balls (about the size of tennis balls) and simmer in salted water.
It is great with saucy meats!
The only brands I've ever seen are Streit's and Manischewitz, in the Kosher food section of the supermarket. I've got some pretty tasty sponge cake recipes that use potato starch! Kosher for Passover.........
Wine is the food that completes the meal.