What can produce a bitter taste in fries?

Excessive heat in oil can lead to a bitter taste in fries primarily due to the breakdown of the oil. When oil is heated beyond its smoke point, it starts to degrade and can produce off-flavors, including bitterness. This occurs because the high temperatures can lead to the formation of free fatty acids and other compounds that alter the flavor profile of the oil and the fries themselves.

Maintaining the right temperature is crucial for frying as it ensures that the fries cook evenly and do not absorb excess oil, which can contribute to undesirable flavors. Proper management of frying temperature prevents the oil from burning and helps ensure that the fries are crispy and flavorful without any bitterness.