Pasta with asparagus, porcini mushrooms and truffle oil

ingredients
1 leek
1 clove garlic
olive oil
30gr porcini mushrooms, dried
500gr asparagus
salt 
pepper
500gr pasta
truffle oil


istructions
Soak the dried mushrooms in warm water for 20 minutes.
Rince the asparagus, break off the tough ends and cut them in pieces.
Cook pasta following the directions on the box.
Chop the leek and the garlic.
Heat a small amount of olive oil in a frying pan and gently cook them until tender.
Add the asparagus and some of the mushroom water and simmer for 3-4 minutes.
Drain the mushrooms, cut them  and add them to the sauce with the asparagus.
Add salt and pepper.
Toss the pasta in the sauce.
Serve them with 2-3 Tbs truffle oil.