Add butter to a large Dutch oven over medium heat and allow it to melt. Once melted add onion and celery. Cook for 3-4 minutes, or until the onion becomes translucent. Mix in garlic and continue sauteing for 30 seconds or until it becomes fragrant.
3 Tbsp. butter, 1 small yellow onion, 2 celery rib, 2 garlic cloves
Stir in flour, paste, seasoning, and salt. Cook for 2-3 minutes, stirring occasionally.
¼ cup flour, 2 Tbsp. tomato paste, 1 ½ tsp. Old Bay seasoning, ½ tsp. salt
Pour in the stock or broth and add the bay leaves. Turn the heat to high and bring everything to a boil. Reduce the heat to low, cover, and let simmer for 15-20 minutes.
4 cups fish stock, 2 bay leaves
Remove the bay leaves and pour in the half and half and lemon juice. Purée the soup with a handheld immersion blender until smooth, or carefully transfer it to a high-speed blender or food processor.
1 cup half and half, ½ lemon
Once puréed until creamy, stir in half of the crabmeat. Serve the bisque immediately with additional crabmeat and a sprinkle of finely chopped fresh parsley.
1 lb. lump crabmeat, Parsley