The correct way to spell potato...

If  GH    can stand for    P    as in    Hiccough

If  OUGH  can stand for    O    as in    Dough

If  PHTH  can stand for    T    as in    Phthisis

If  EIGH  can stand for    A    as in    Neighbour

If  TTE   can stand for    T    as in    Gazette

If  EAU   can stand for    O    as in    Plateau

Then the right way to spell POTATO should be:
          "GHOUGHPHTHEIGHTTEEAU"