Steamed Clams With Garlic and Mushrooms

Ingredients

• 3 tablespoons unsalted butter
• 2 tablespoons olive oil
• 4 cloves garlic, minced
• 2 shallots, thinly sliced
• 1 cup finely diced mushrooms
• 1 cup dry white wine
• 1 cup clam juice or water
• 24 to 48 (about 12 per person) small fresh clams, scrubbed and well rinsed
• 4 cups cooked linguine (optional)
• salt
• freshly ground black pepper
• 2 to 3 tablespoons chopped fresh Italian parsley, for garnish