Cook the Potatoes:
• Wash and boil whole, unpeeled potatoes in salted water for 25-30 minutes until fork-tender.
• Drain, cool slightly, then peel while still warm.
Mash the Potatoes:
• Mash the potatoes until smooth (use a potato ricer or masher for best results; avoid overmixing).
• Let the mashed potatoes cool to room temperature.
Make the Dough:
• On a clean surface, spread the mashed potatoes and sprinkle with salt.
• Add the egg yolk and grated Parmesan, mixing gently with your hands.
• Gradually add flour, about 50 g (0.4 cups) at a time, kneading lightly until a soft, slightly sticky dough forms. Avoid over-kneading to keep the gnocchi tender.
Shape the Gnocchi:
• Divide the dough into 4 equal parts.
• Roll each part into a 2 cm (0.75 inch) thick rope on a lightly floured surface.
• Cut the ropes into 2-3 cm (0.75-1 inch) pieces.
• Optional: Roll each piece over a fork or gnocchi board to create ridges for sauce to cling to.
Cook the Gnocchi:
• Bring a large pot of salted water to a gentle boil.
• Drop in the gnocchi in batches (don't overcrowd). Cook for 2-3 minutes or until they float to the surface.
• Remove with a slotted spoon and drain well.
Serve:
• Toss with your favorite sauce (e.g., tomato, pesto, or butter and sage), or add toppings like sautéed spinach, mushrooms, seafood, or extra Parmesan.
• For Gnocchi alla Sorrentina, bake with tomato sauce and mozzarella until bubbly.
• Alternatively, pan-fry cooked gnocchi in butter for a crispy texture.