Ingredients
Method
1.Bring stock, the water, thyme, bay leaf and peppercorns to the boil in large saucepan. Add fish, reduce heat; simmer gently, uncovered, about 1 minute or until cooked through. Using a slotted spoon, remove fish from pan; divide fish among four 1½-cup (375ml) ovenproof dishes. Strain liquid through sieve into large heatproof jug. Discard solids; reserve stock.
2.Boil, steam or microwave potato until tender; drain. Push potato through sieve into large bowl; add milk and half the butter, stir until smooth. Cover to keep warm.
3.Preheat oven to 220°C/425°F.
4.Melt remaining butter in medium saucepan, add flour; cook, stirring, until mixture bubbles and thickens slightly. Gradually stir in reserved stock; cook, stirring, until mixture boils and thickens. Stir in herbs; season.
5.Divide sauce among dishes; cover each with potato mixture. Place dishes on oven tray.
6.Bake pies 15 minutes or until browned lightly.