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

Ingredients

• 4 slices, country-style bread
• Olive oil
• Salt and pepper
• 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
• 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

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