01 -
Melt butter in a large saucepan over medium heat. Add celery and green onions, sautéing until softened, about 4 minutes.
02 -
Sprinkle flour over the sautéed vegetables, stirring continuously for 1 minute to form a smooth roux.
03 -
Warm the milk in the microwave or on the stovetop until just heated. Gradually whisk milk into the roux, blending until no lumps remain.
04 -
Add heavy cream, tomato paste, Old Bay seasoning, salt, and pepper. Continue whisking to combine fully.
05 -
Reduce heat to low and bring mixture to a gentle simmer. Cook for 20-25 minutes, stirring occasionally, until thickened to desired consistency.
06 -
Gently fold in shrimp and crab meat. Simmer 5-7 minutes longer, ensuring seafood is thoroughly heated but not overcooked.
07 -
Ladle bisque into individual bowls and top with chopped fresh parsley before serving.