Red wine and porcini mushroom sauce | Something New For Dinner

Ingredients

• 1/2 ounce dried porcini mushrooms
• 2 cups boiling water
• 2 small onions
• 6 T butter, divided
• 2 cloves garlic
• 2/3 cup shallots
• 1 carrot, peeled
• 1 rib celery
• 1 T tomato paste
• 2 sprigs parsley
• 1 sprig thyme
• 1 bay leaf
• 4 black peppercorns
• 1 bottle of dry red wine
• 2/3 cup veal or beef demi-glace
• Salt and pepper to taste