A method of making long-sliced deep-fried potato chips from whole, raw potatoes having an elongate shape and an apparatus for performing the method; the method comprising providing a horizontally elongated mesh strainer in a vat holding a bath of cooking oil and heating the cooking oil to a pre-selected frying temperature; loading the potatoes into a slicing mechanism at one end of the vat of cooking oil with the long potato dimension being oriented to correspond to that of the mesh strainer, moving the slicing mechanism back and forth over the vat of cooking oil and concurrently slicing the potatoes in the long dimension thereof to dispense raw potato slices to fall into the cooking oil in a scattered manner, deep-frying the potato slices into potato chips during a controlled cooking sequence and removing the mesh strainer from the cooking oil. The method further comprises processing the potato chips for marketing such chips by seasoning and dehydrating.