Martha Collison's fish pie

Martha Collison's fish pie

    • Serves6
    • CourseMain meal
    • Prepare30 mins
    • Cook35 mins
    • Total time1 hr 5 mins
    • 750g potatoes (approx 3 large)
    • 75g butter
    • 2 leeks, finely sliced
    • 1 garlic clove, crushed
    • 3 tbsp plain flour
    • 50ml dry white wine
    • 175g Cheddar cheese, grated
    • 1 tsp mustard powder
    • 500g fish pie mix (from the fish counter, or thawed from frozen)
    • 150 tbsp raw king prawns