Costco stores in South Korea offer chopped onions for hot dogs. Koreans have a different ideaReporting from SEOUL — The sound of silverware scraping plates reverberates through the Costco cafe, competing with the chatter of customers. It is the sound of scooping onions. Chopped onions are being scooped onto hot dogs, onto baked bulgogi sandwiches — and directly into people’s mouths, along with healthy dollops of mustard and ketchup. One aficionado calls it “onion salading.” The menus ins
