Tournedos of Beef in Mushroom, Mustard and Red Wine Sauce with Caramelized Onion-Potato Gratin

Deselect All

Croutons:

4 slices, country-style bread

Olive oil

Salt and pepper

Tournedos and Sauce:

2 tablespoons olive oil

1 tablespoon unsalted butter

4 beef fillet steaks, about 6 ounces

Salt and coarsely ground black pepper

1 pound shiitake mushrooms, cleaned and quartered

2 shallots, finely diced

1 cup red wine

1 cup beef broth

2 tablespoons Dijon mustard

2 tablespoons cold unsalted butter

Onion and Potato Gratin:

2 tablespoons olive oil

3 large Spanish onion, peeled and sliced thinly

2 cloves garlic, finely chopped

Salt and freshly ground black pepper

4 large potatoes, peeled and sliced thinly

3 tablespoons balsamic vinegar

1 1/4 cups heavy cream

1/4 cup finely chopped fresh parsley

1 cup grated Gruyere cheese