When I was in the concession business we cut our own fries. Thgis is what I have been told
Two important qualities of each variety determine the best way to prepare it. These are:
Starch content
Moisture content
High starch/low moisture potatoes are also described as having high solids. Washington russet varieties average 20-23 percent solids and are best for baking, mashing, frying or pureeing.
High starch/low moisture Russet Burbanks are preferred for French frying because their low sugar content keeps them from discoloring as they fry and because starch on the surface of the cut potatoes expands with the heat and dries the surface as it absorbs water from the potato. The result is a crisp skin with a fluffy interior.
Scrub potatoes well. Peel or not? Some menus now feature fries with peel on. Cut into desired shape - usually 3/8-inch thick. For crisp finished fries, chill peeled, cut potatoes in cold water to cover, with lemon juice or vinegar (1 ounce per gallon water) added to water to prevent darkening, for 1/2 to 2 hours before frying. Rinse, then drain well or spin dry and dry on paper towels. (Any moisture on potatoes will cause oil to spatter and can be dangerous.)
Heat high quality vegetable oil in fryer to 375°F. Add 2 pounds (depends what size your fryer is) prepared potatoes to fryer basket, put into hot oil and cook until golden brown and cooked through, about 4 to 5 minutes. The other thing we had was curly fries that machine made me a fortune and because it cut it so thin they were fast to cook.