In this recipe, which chef Eric Lees used to make at Spiaggia in Chicago, easy-to-make gnocchi made from russet potatoes, Parmigiano-Reggiano, and egg yolks are paired with a buttery tomato sauce laced with fresh basil. Lee uses a potato ricer to make the gnocchi, but if you don't have one, grate the cooled potatoes on the small holes of a box grater for a similar texture.