While dining at Soot Bull Tak Tak, a barbecue restaurant in Seoul, Korea, chef Deuki Hong could not stop snacking on the oi muchim, pickled cucumber banchan, that was served alongside the barbecue. "This pickle was tart, slightly sweet, a little effervescent, and addictive," he writes in his book Koreaworld: A Cookbook. Its secret ingredient? Lemon-lime soda. Naturally, he had to include his own take in his book, "which we think is the best banchan ever to serve with barbecue at home," he adds.