<<Disclaimer: Verify this information before applying it to your situation.>> Are you allergic to cornstarch ? If not you could use cornstarch one on one for the arrowroot in the recipes. If you are "crazy" enough to make your own arrow root powder you can try the two following things.: 1. Go to chinese or other asian stores and purchase dried arrowroot pieces. You can soak them and cook them like potatoes.Once they are cooked you could mash them and use them in the recipe You have to adjust the liquid in the recipe. 2. If you are really wild you do the following.Buy the arrowroot pieces and a big piece of white linnen. Cook the arrowroot until totally overcooked and falling apart. Now through out the left over pieces,but keep the water. Spread the linnen outside in the hot sun and pour the water through the linnen,making sure you collect the water that runs through. Let dry and scrape of the white powder that you now will see. Repeat until all water is gone. Arrowroot and cornstarch are interchangebal and do the same thing,there is no real advantage by using arrowroot except if you are allergic . Arrowroot might be slightly easier to digest. Ted Wolff Again i cannot mention the company that could get you glutenfree arrowroot powder because i am sort of connected to them. I heard they do like bearberries. Ted