GHOUGHPHTHEIGHTTEEAU!
If GH can stand for ''P'' as in Hiccough?
If OUGH stands for ''O'' as in Dough?
If PHTH stands for ''T'' as Phthisis?
If EIGH stands for ''A'' as in Neighbour?
If TTE stands for ''T'' as in Gazette?
If EAU stands for ''O'' in Plateau?
Then the right way to spell POTATO should be
GHOUGHPHTHEIGHTTEEAU!