Step 1

In a medium saucepan over medium heat, melt butter.

Step 2

Whisk in flour until it forms a paste (roux). Cook for 3 - 4 minutes.

Step 3

Add chicken stock and lemon juice while whisking constantly.

Step 4

Add garlic, salt and pepper. Stir to combine and bring to a simmer.

Step 5

Add langostinos, cook for 1 - 2 minutes to warm langostino.

Step 6

Remove from heat and add chopped parsley. Serve.