Potato Starch

Let me tell you about potato starch, and why a cook treats it with respect.

Potato starch is a fine white powder, made from potatoes and nothing else. Stir it into a hot fruit syrup and watch: it turns clear and glossy, never cloudy, never milky. That glossy look is how you know it's doing its job. This is why cooks reach for it in kissel, in delicate sauces, in fillings that should shine on the plate, not sit there dull.

Choose it by touch and smell, not by the label. Rub a pinch between your fingers: it should feel silky, almost slippery, never grainy or chalky. Smell it — nothing, truly nothing. Any sour or musty note is a warning, and good starch simply shouldn't have one.

Some people say starch is starch and you can swap potato starch for cornstarch one for one. No! Put your hand on the spoon and you'll feel the difference — potato starch thickens fast and loose, cornstarch holds tighter and takes longer. A cook who forgets this keeps stirring and boiling a potato-starch kissel long after it's ready, and watches it go thin and watery in the pot instead of staying glossy. Watch the spoon, not the clock: the moment the kissel turns glossy and coats it like a ribbon, pull it off the heat.