Americans have always borrowed brilliantly. We took French technique and applied it to Southern ingredients. We adopted Italian pasta and made it our own with local cheeses and garden tomatoes. And somewhere along the way, the aromatic soups of Thailand found their way into our summer kitchens, where they belong.

This soup operates on a simple principle: infuse fat with flavor, then chill it until it becomes something almost dessert-like in its silkiness. The coconut milk carries the lemongrass and galangal the way cream carries vanilla in a custard. Cold, it hits your palate differently than hot soup. The aromatics bloom slowly. The richness feels lighter. The lime cuts through with unexpected brightness.

I've served this at backyard gatherings from Portland to Austin, and it stops conversation every time. People expect cold soup to be gazpacho or vichyssoise. They don't expect coconut milk infused with Southeast Asian aromatics poured over pink shrimp. The surprise is part of the pleasure.

Make the broth a day ahead. Let those flavors marry overnight in the refrigerator. The soup improves with time, which means the hardest work happens before your guests arrive. That's the mark of intelligent summer cooking.