Chilled Fish Molokai Sweet Potato Soup

This Hawaiian-inspired chilled sweet potato soup uses Molokai purple sweet potatoes (also called Okinawan sweet potatoes) as its base, which gives the finished soup a beautiful lavender-gray color that changes to vivid purple depending on light. Diced leeks saute in margarine, white wine deglazes the pan, and the sweet potatoes simmer in fish stock until tender.

Limu, the Hawaiian term for edible sea vegetables, adds subtle oceanic minerality that makes this soup taste distinctly Pacific rather than just another vegetable puree. Any mild sea lettuce or dulse works if you can’t find true limu.

Red snapper gets a quick blanch in stock and chills for the topping. The finished soup, pureed smooth and thinned with skim milk to the desired consistency, goes into bowls over the chilled fish for a cool-on-cool starter that reads summer-elegant.

Chef Tips

• Blanch the snapper gently, about 2 minutes in simmering (not boiling) stock. Overcooked fish turns tough and doesn’t soften when it hits cold soup.
• Use purple Molokai sweet potatoes if you can find them. Regular orange sweet potato works but loses the signature purple color.
• Puree in batches if the soup volume is large. Overfilled blenders can splash hot liquid out the lid.
• Chill the pureed soup at least 3 hours before serving. The flavor mellows and the texture thickens slightly as it cools.
• Taste and adjust with salt and milk after chilling. Cold dulls flavor perception; a dish seasoned perfectly warm may taste flat cold.

Variations

• Swap red snapper for mahi-mahi, hiramasa, or any firm tropical white fish.
• Use regular orange sweet potatoes for a golden-hued version without the need for specialty purple varieties.
• Garnish with a drizzle of chili oil and a scatter of microgreens for a restaurant-style finish.