A few years ago when we visited Iceland, we had an amazing langostine stew at Fjörubordid near Reykjavik. It was so good, we detoured to return on our way back through. This recipe (which we haven't made yet) looks close to replicating it.

• 2 lb. shell-on whole langoustines
• 8 tbsp. unsalted butter
• 2 tbsp. olive oil (for stock)
• 2 carrots, minced (for stock)
• 2 stalks celery, minced (for stock)
• 1 large yellow onion, minced (½ for stock)
• 2 tbsp. tomato paste
• 2 tsp. paprika
• Kosher salt and freshly ground black pepper, to taste
• 12 cups fish stock
• 2 cloves garlic, minced
• 1 tbsp. mild curry powder
• 1 1⁄2 cups heavy cream
• 1 cup dry white wine
• 2 tbsp. minced chives

Make a stock:

Do ahead: Remove heads and shells from langoustines and lightly crush; chill tail meat until ready to use. Heat 1 tbsp. butter and the oil in an 8-qt. saucepan over medium-high. Cook shells, carrots, celery, and half the onion until vegetables are soft, 6–8 minutes. Stir in tomato paste, paprika, salt, and pepper; cook 2 minutes. Add stock; simmer until reduced by half, about 2 hours. Strain stock.

Wipe pan clean and add 4 tbsp. butter; melt over medium. Cook remaining onion and the garlic until soft, 3–4 minutes. Stir in curry powder; cook 1 minute. Add 1 cup cream and the wine; cook until reduced by half, about 20 minutes. Add reserved stock; boil. Reduce heat to medium-high; cook until slightly thickened, about 30 minutes. Keep soup warm.

Whip remaining cream in a bowl into semi-stiff peaks. Melt remaining butter in a 12" skillet over medium-high. Season langoustine tails with salt and pepper; cook, flipping once, until cooked through, 3–5 minutes. Divide soup between bowls and top with langoustines; garnish with whipped cream and chives.

From https://www.saveur.com/article/recipes/icelandic-creamy-langoust...">Saveur