Potato Ravioli, with Mushrooms, Garlic and anchovies

Here is my version for potato ravioli, based on a recipe of Paul Rankins, It sounds very plain and dull, but it is completely the opposite - try it.

50gm butter
1 small onion
3 cloves of garlic
450g potatoes, peeled and cut into 1 cm cubes
175ml milk
20g dried mushrooms
3 tbs chopped chives
Salt and black pepper
Fresh pasta( made with 285g pasta flour or strong plain flour, 1/2tsp salt, 2 large beaten eggs, 1tbs olive oil, flour for dusting)
1 egg
6 anchovy fillets, roughly chopped

Heat 25g butter in a large frying pan,
Add the chopped onion and 1/3 of the garlic.
Sauté gently for about 3 mins.
Add the potatoes, half of the dried mushrooms and the milk and cover, cook over a very low heat until tender.
Mash the potato mixture with another knob of butter, add 2 tbs of chopped chives and season.
Put remaining chopped dried mushrooms into a bowl and cover with boiling water - leave to soak until later.
Make the pasta in a food processor. Then using a pasta machine roll out into thin sheets the width of the pasta machine.

Place one sheet of pasta on a flat surface, lightly floured, On one long side of the pasta place small spoonfulls of the potato mixture about 7.5 cm appart.
Brush the edges of the pasta and between the potato mixture with beaten egg, fold over the other half over the filling and press to seal around the potato mounds. Cut the ravioli into square and make sure the seals are closed by using the prongs of a fork to seal the edges of each pasta parcel.
Put to one side on a lightly floured tray.
Repeat with the remaining pasta.

To serve, cook the pasta in a large pan of boiling salted water until the ravioli rises to the surface, this only takes 2 - 3 minutes.
In the meantime prepare the dressing.
In a small pan heat the remaining butter, add the remaining soaked dried mushrooms, cook for a few minutes and boil off the liquid until a small amount is remaining. Add the anchovies, the oil from the tin/jar, remaining chopped chives and the garlic and a little course ground black pepper and just heat through.

Drain the pasta and serve on warm plates, drizzle with the dressing and serve immediately.