A sidekick of the comfort food trend, boozy milkshakes are appearing across a broad range of bars and restaurants, from posh clubs to burger chains. The Powder Room in Hollywood, California, offers the Velvet Goldmine, a $500 concoction made with dark chocolate ganache, cognac, English lavender split black bean Tahitian vanilla ice cream and chocolate caramel fudge, topped with fresh whipped cream and edible 23 carat gold flakes. It includes a Swarovski Crystal Nirvana ring for every customer.