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Preheat oven to 200C/400F/Gas 6.
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Bring a large pan of salted water to the boil, then add the cauliflower and cook for two minutes.
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Drain and place in a buttered ovenproof dish.
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Place the butter and flour into a saucepan and heat to melt the butter.
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Cook, stirring for one to two minutes until lightly golden.
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Remove from the heat and gradually whisk in the milk to form a smooth sauce.
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Return to the heat and simmer for two to three minutes.
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Remove from the heat and beat in the egg yolks, mustard and Worcestershire sauce.
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Season with salt and pepper and flake the salmon into the sauce, stirring carefully.
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Pour over the cauliflower and top with the grated cheeses.
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Place in the oven and cook for 10-15 minutes, until golden brown. Serve immediately.
I like to serve this without the salmon as a vegetable dish.