The potato is a starchy, tuberous crop from the perennial nightshade Solanum tuberosum. In many contexts, potato refers to the edible tuber, but it can also refer to the plant itself -- Wikipedia 3 Feb. 2019.
After trying a number of different ways of making French Fries this technique is a winner. The goal is a crispy outside with a gooey inside. I have used red, russet and sweet potatoes, and they have all turned out well. Sweet potatoes seem to work better with a lower final cooking temperature and a larger width, and never seem to get as crispy, but I like the flavor.
Except in certain cases (like breads or making a roux), measurements are estimates. Spices I usually eye then adjust with tasting. Pepper should be freshly ground to get the best flavor even though this can be tiring for large amounts!