Porcini mushroom with basalmic vinegar sauce

So I made a beef roast tonight and wanted a sauce to go with it.  I came up with this tastiness. 

1 package of dried porcini mushrooms, reconstitute with 1 cup of warm water.

Chop two shallots and 3 cloves of garlic.  Add olive oil to a pan and add shallots and cook for about 3 minutes, just until the edges become translucent.  then add the chopped garlic and stir 2 minutes.  Add about 1/2 cup of basalmic vinegar, salt, and pepper.  Cook for about 3 minutes, add mushrooms and liquid.  Cook for about 15 minutes until reduced.  Pour over sliced beef.  It's. Super. Good.