You can add either the optional dry potato starch or the natural starches from the shredded potatoes instead. The starch helps make crispier latkes with soft insides. Pro tip: add a piece of carrot to the oil to soak up the brown bits that flake off while frying so they don't get in your latkes! Replace the carrot piece with another when it gets very brown. Latkes are best served hot off the stove but can be kept warm in the oven at 250 degrees F. To make them ahead of time, fry as usual, then freeze the latkes on a baking sheet and store in a freezer-safe resealable bag. When ready to serve, let the latkes thaw slightly, then reheat in the oven at 375 degrees F for 10 to 15 minutes. The dip can be made up to 3 days ahead and stored in the refrigerator.