Step 1

Heat oil in a large saucepan over medium-high heat. Add onion and celery. Cook, stirring, for 5 minutes or until softened. Add garlic and paste. Cook, stirring, for 30 seconds or until fragrant. Stir in flour. Cook for 1 minute.

Step 2

Gradually stir in stock, coconut milk and 1 cup water. Add potato. Bring to the boil. Reduce heat to medium-low. Cover. Simmer, stirring occasionally, for 15 minutes or until potato is just tender.

Step 3

Add prawns and fish. Cook, uncovered, for 5 minutes or until seafood is just cooked through. Season with salt and pepper. Top with onion. Serve with coriander sprigs and lime wedges.