Rub 80g butter into self-raising flour until it resembles fine breadcrumbs. Stir in 1/2 cup cheese and dill. Mix with hands until it comes together to form a dough. Shape into a small rectangle, wrap in greaseproof paper and place into the freezer for 30 minutes or until firm.
Preheat oven to 200°C. Melt remaining butter in a saucepan over high heat. Add plain flour and cook for 1 minute. Remove from heat and slowly add milk, stirring constantly. Return to heat and stir over medium-high heat until sauce comes to the boil.
Add remaining cheese. Reduce heat to low and simmer for 3 minutes. Remove from heat and allow to cool slightly.
Stir salmon and egg into sauce. Season. Spoon into 4 x 3/4-cup capacity or 1 x 4-cup ovenproof baking dish.
Remove dough from freezer and grate. Sprinkle over mornay. Bake for 25 to 30 minutes or until top is hot and golden.
For an alternative & yummy topping to a tuna or salmon mornay or casserole crush a 50g to 100g (depending on how many servings you are making) packet of potato crisps and sprinkle them on top of the casserole. Sprinkle some grated cheese on top and bake in the oven.
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