Wine-Marinated Flank Steak with Pinot Noir Mushroom Sauce

Name: Wine-Marinated Flank Steak with Pinot Noir Mushroom Sauce
Cuisine: European, Mediterranean, French
Ingredients: 2 to 3 pounds flank steak; 3 cups pinot noir or other dry red wine; 4 shallots, peeled and thinly sliced crosswise; 2 cloves garlic, peeled and crushed with the side of a cleaver; 1 teaspoon fresh thyme leaves; 2 tablespoons extra virgin olive oil, plus oil for brushing the steaks; 3 tablespoons unsalted butter, at room temperature; 1 strip bacon, cut crosswise into 1/4 inch slivers; 6 ounces shiitake mushrooms, stemmed and cut into 1/4 inch slices; 1 teaspoon cornstarch; Sea salt and freshly ground black pepper; 2 tablespoons chopped fresh chives; 1 cup beef stock