Step 1

Heat butter, oil and garlic in a medium frying pan over a medium-high heat until butter has melted. Add flour and cook for 1 minute, stirring, until mixture bubbles.

Step 2

Pour in stock, stirring constantly to prevent lumps forming. Add cooking cream and lemon juice and rind. Cook, stirring, for 3 minutes or until sauce boils and thickens. Add mustard. Season with salt and pepper.

Step 3

Add prawns. Simmer, stirring, for 3 minutes or until prawns are cooked through. Sprinkle with chives and serve over pasta.