Ingredients * 2 lb. shell-on whole langoustines * 8 tbsp. unsalted butter * 2 tbsp. olive oil * 2 carrots, minced * 2 stalks celery, minced * 1 large yellow onion, minced * 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 Instructions 1. 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. 2. 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 ...