Final answer:
Final cooked fries should have a crispy exterior and a fluffy interior, with mealy potatoes often being the preferred choice for their low moisture and high-starch content.
Step-by-step explanation:
Final cooked fries should be cooked until they are crispy on the outside and like a fluffy potato on the inside. This balances the texture contrast that is desirable in a perfectly cooked fry. To achieve a crispy exterior, the fries need to be fried at the correct temperature until they have a golden-brown appearance.
On the inside, they should be fluffy and steamy, similar to the texture of a baked potato. The potato choice is also crucial, with mealy potatoes often being preferred for frying due to their low moisture and high-starch content, which helps achieve that desired fluffy interior.