Pasta with Anchovy Sauce

This recipe is from Nigella Lawson's 'How to Eat', but the original called for marsala and parsley, which I didn't have, so this is my simplified version.

Ingredients (serves 1)
1/2 medium onion, finely diced
1 tsp sunflower oil
6 anchovy fillets
50 ml semi-skimmed milk
85g pasta (I used tagliatelle)

* Drain the anchovy fillets of oil and pat dry on some kitchen towel. Place in a small bowl and cover with milk
* heat the oil in a pan and add the onion. Cook gently on a low heat for at least 25 minutes until softened and golden.
* heat up a pan of water and put the pasta on to cook
* remove the anchovies from the milk and finely chop.
* add the anchovy to the onions and stir well, then stir in the milk and remove from the heat
* Drain the cooked pasta, return to the pan and stir in the sauce

Obviously if you don't like anchovies - steer clear!