If cuisine were weaponry, the Germans and the Poles would rule the world, so frightening is their grub. Yet once they ruled it, they'd have to contend with the Irish, a people whose cuisine is the equivalent of an indigestible doomsday bomb. Yet their grub can be civilized. Stumbling around Dallas for more than 10 years, The Tipperary Inn shut down for several months last year to have new pub guts transplanted and a new refined temperament installed. It now features an Irish bar lifted from a Dublin mayor's one-time domicile, a phone booth and stained-glass windows installed in snuggly booths. It even has bookcases with actual books, for those who like to keep track of their intake via gradually collapsing literacy. Plus, The Tipp has an upscale menu, if that is possible in the world of rashers and boxty. The Tipp serves oysters on the half-shell squirted with Guinness, grilled quail, damn good fish and chips, and grilled filet mignon.