If you're worried about her ordering the most expensive thing on the menu, don't take her to the Serendipity 3 Restaurant on New York City's Upper East Side. There she might be tempted to order the "Frrrozen Haute Chocolate", a $25,000 dessert that has been certified by Guinness World Records as the most expensive in the world.
How do you turn what looks like your average, everyday chocolate mousse into a retirement-account-draining record setter? Add gold. Lots of it. At Serendipity 3 they start the Frrrozen Haute Chocolate by taking a dessert glass and coating the inside with 18 karat gold leaf (which is completely edible). Then they pour in a chocolate mixture made with 28 rare and exotic cocoas from around the world, add shaved black truffles and whipped cream (I'm guessing freshly whipped, not Cool Whip), and top it off with 23 karat gold shavings (which is the same stuff Trump sprinkles on his breakfast cereal every morning).
A delicacy this indulgent can't be eaten with a déclassé silver spoon, either. So it's served with a solid gold one instead. And to add some class to the dessert glass, a gold and diamond crown is used for decoration. Which you get to keep. (Along with the gold spoon your date stashed in her bag.)
So how does a $25,000 dessert taste? Samplers described it as "just like a frozen hot chocolate". That's it? For 25 large it should put you in a multi-orgasmic culinary euphoria that could possibly result in a coma.