01 -
Place reserved shrimp shells in a saucepan with 4 cups of water. Bring to a boil, reduce heat and simmer for 30 minutes. Strain through a sieve and discard shells. Add water to make 4 cups of broth. Set aside.
02 -
Heat olive oil in a 4-quart Dutch oven over medium heat. Add diced shallot and cook until soft but not browned, about 3 to 4 minutes. Add minced garlic and sauté for another minute.
03 -
Stir in cayenne pepper and shrimp, cooking until shrimp turn pink, 3 to 4 minutes. Remove 6 shrimp and reserve for garnish. Pour in brandy, cooking 1 to 2 minutes to evaporate alcohol. Add dry sherry and cook 3 minutes more.
04 -
In batches, transfer shrimp mixture to a blender and puree until smooth. Return puree to Dutch oven.
05 -
Melt butter in the Dutch oven over medium-low heat. Whisk in flour and cook for 1 minute. Gradually add heavy cream and milk, whisking until mixture thickens and smooth.
06 -
Slowly stir in shrimp broth, pureed shrimp mixture, tomato paste, salt, and ground white pepper. Heat gently while whisking continuously. Avoid boiling to prevent curdling. Adjust heat as needed.
07 -
Ladle bisque into bowls, garnish with reserved shrimp and chopped parsley. Drizzle each serving with 1 tablespoon truffle oil.