Velvety Charleston she-crab soup made with lump crab and a splash of sherry is a refined Southern classic. This protein-rich, elegant soup is a Lowcountry family tradition that's creamy and indulgent.
Melt unsalted butter over medium heat in a large heavy pot. Add finely chopped onion and celery; sauté for 5 minutes, stirring frequently until soft but not browned.
Sprinkle in flour and cook, stirring constantly, for 2 minutes to form a blond roux. This controls thickness and prevents a raw flour taste.
Gradually whisk in warm milk and heavy cream until smooth, then bring to a gentle simmer, adjusting heat to avoid scorching. Continue simmering for 10 minutes to blend flavors.
Temper the egg yolks by whisking them with a splash of the hot soup mixture, then add back into the pot, stirring constantly to avoid curdling. Simmer gently for 1–2 minutes—do not boil.
Stir in lump crab meat, Old Bay seasoning, salt, white pepper, and sherry. Heat through for 2–3 minutes over low heat to preserve crab texture.
Ladle soup into bowls, garnish with parsley, and serve immediately.