INGREDIENTS (serves 4)
- 2 ½ cups cold leftover mashed potatoes
- 1 large egg yolk
- 3 tablespoons extra-virgin olive oil
- 1 ¼ cups all-purpose flour, plus more for dusting
- 1 tablespoon salt
- 3 tablespoons unsalted butter
- Pinch freshly ground of black pepper
- 8 fresh sage leaves, finely sliced
- ¼ cup grated Parmesan cheese
- In a medium bowl, combine potatoes, egg yolk, olive oil, flour, and 3/4 teaspoon salt. Using a wooden spoon, stir until incorporated. Divide dough into fourths. Line a baking sheet with parchment paper.
- On a lightly floured work surface, roll one-fourth of the dough into a 3/4-inch-diameter log. Cut the log into 3/4-inch-long pieces. Pick up one piece of dough, and press onto the back of a fork with your thumb; the indentations from the tines should be visible. Place the gnocchi on the prepared baking sheet. Repeat process with the remaining pieces of dough, arranging finished gnocchi in a single layer. Repeat with the remaining three portions of dough.
- Fill a large saucepan with water, and add 2 teaspoons salt; bring to a boil. Have ready a colander set over a bowl. Add one-fourth of the gnocchi, and cook until they float to the top, 2 to 4 minutes. Using a slotted spoon, transfer cooked gnocchi to the colander. Cook the remaining gnocchi.
- Place a large sauté pan over medium heat. Add butter. When butter begins to brown, about 2 minutes, add pepper and the remaining 1/4 teaspoon salt. Increase heat to medium-high. Add the gnocchi and sage. Cook, stirring occasionally, until the sage has wilted and the gnocchi have heated through, 1 1/2 minutes. Serve immediately, with a sprinkle of Parmesan cheese.