If Commodore Perry had known it would come to this, he might have stayed at home. Hard Rock Cafe Yokohama is commemorating the port opening with its Black Ships Burger (¥1,859). This limited-time-only concoction squeezes a 180g beef patty, melted Monterey Jack cheese, marinara sauce and fried onions between a pair of soot-colored buns, in memory of Perry’s infamous Black Ships—which arrived here in… 1853. Oh, never mind. In typical Hard Rock style, diners can also pick up one of a range of limited-edition pin badges that are only available during Y150. If you’re on a tight budget, meanwhile, Mos Burger is celebrating the effect that Westernization has had on Japanese waistlines with a pair of super-sized burgers that will be sold at all 37 of its Yokohama branches through August 16.

● Hard Rock Cafe Yokohama: A1 Queens Tower, 2-3-1 Minato Mirai, Nishi-ku, Yokohama. Tel: 045-682-5626. Open daily 11am-11pm. Nearest stn: Minato Mirai. www.hardrockjapan.com

● Mos Burger: www.mos.co.jp