Gnocchi alla Romana:Roman-Style Gnocchi

INGREDIENTS

• 6 tablespoons butter plus 2 tablespoons
• 3 cups milk
• 1 cup semolina, quick cooking or finely ground cornmeal
• 1 teaspoon salt
• 4 egg yolks
• 1/4 pound taleggio, cut into chunks
• 1/2 cup freshly grated Parmigiano-Reggiano, plus 1/2 cup