What is one technique to ensure a quality fry when using sugar potatoes?

To ensure a quality fry when using sugar potatoes, cooking fries for a longer duration is integral. This technique allows the sugar content in the potatoes to caramelize properly, leading to a desirable texture and taste. Longer cooking times facilitate the evaporation of excess moisture, which can otherwise lead to soggy fries, helping to achieve the crispy exterior that is typically sought after in frying.

Cooking at high temperatures can also play a significant role; however, it is the duration of cooking that ensures the inside is cooked through while the outside becomes nicely crisp. The other options, such as using cold water or changing water infrequently, do not contribute to the desired quality of the fries in the way that adjusting cooking time does, as they may not directly affect the frying process itself or the final texture.