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Just in time for Valentine's Day, Nestlé has unveiled a pink KitKat — the first commercially available product made from so-called ruby chocolate. Last September, a Swiss company announced it had discovered a fourth type of chocolate — after dark, milk, and white — while working with ruby cocoa beans, which produce a distinct berry flavor. Nestlé's new treat, officially called the KitKat Chocolatory Sublime Ruby (about $4), can't be bought in stores outside Japan or South Korea, but Americans can order it online from Japan, where KitKats are so popular they're available in more than 300 different flavors, including green tea, cherry blossom, wasabi, and even sushi.