Melt the ghee in a large pot over medium heat.
Add the onion, celery, and carrot, sautéing until the vegetables are softened and fragrant.
Stir in the tomato paste, sea salt, black pepper, and dried thyme, cooking for one minute to deepen the flavor.
Pour in the dry sherry to deglaze the pan, scraping up any browned bits from the bottom.
Add the seafood stock and bring the mixture to a gentle simmer for 15 minutes.
Use an immersion blender to puree the soup base until completely smooth.
Stir in the heavy cream and the lobster meat, heating through for 5 minutes without allowing the bisque to boil.
Ladle into bowls and garnish with fresh chives before serving.