Gnocchi with Mushroom Sauce Recipe | Epicurious

Ingredients

• 1 1/2 pounds russet potatoes (about 2 medium)
• 1 large egg yolk
• 1/2 teaspoon salt
• 1/4 teaspoon ground black pepper
• Pinch of grated nutmeg
• 7 tablespoons (about) all purpose flour
• 2 tablespoons (1/4 stick) butter
• 2 tablespoons olive oil
• 12 ounces fresh shiitake mushrooms, stemmed, sliced
• 1/2 cup sliced shallots
• 1 3/4 cups chicken stock or canned low-salt chicken broth
• 1 tablespoon chopped fresh sage
• 3 cups coarsely chopped arugula
• 1/2 teaspoon (about) white truffle oil (optional)*
• 1/3 cup grated Parmesan cheese
• *Available at Italian markets, specialty foods stores and some supermarkets.