1.Heat oil in a large saucepan on medium. Cook leek and garlic for 5 minutes, stirring occasionally, until soft but not brown.
2.Increase heat to high, add butter and stir until melted. Add flour and cook for 2-3 minutes, stirring. Remove pan from heat and stir through milk. Return pan to medium heat and bring to a gentle simmer, stirring constantly. Reduce heat to low and simmer for 5 minutes. Stir in fish and simmer for 2 minutes.
3.Remove pan from heat and stir through green onion and dill. Pour into an 8-cup ovenproof dish. Cut potatoes into 5mm slices and arrange over fish. Melt remaining butter and brush over potato. Place under a preheated grill, away from heat, for 8-10 minutes, until golden. Serve with salad and bread.
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