Lamoi (Sue) Snyder and progeny have been serving the spicy cuisine of her native Thailand at this storefront since 1979. In deference to local Southerners, who may never have sampled anything spicier than cheese grits, much of her menu is devoted to mild Cantonese-style Chinese dishes. More adventurous diners, however, flock here to order such authentic tongue-burners as yon voon-sen, a...