Make the dough. Mix flour, eggs, and squid ink. Knead for 8–10 minutes until smooth and elastic. Wrap and rest for 30 minutes.
Prepare the filling. Combine pumpkin purée, drained ricotta, mascarpone, Parmesan, cinnamon, salt, and pepper. Mix until creamy and refrigerate.
Roll the pasta. Divide the dough and roll into thin sheets using a pasta machine, to approximately 0.8–1 mm thickness.
Fill and shape. Place portions of filling on a pasta sheet, cover with another sheet, press out the air, seal carefully, and cut into 7 large ravioli.
Prepare the sauce. Melt butter in a skillet over medium heat. Add sage and cook until the butter is golden brown and fragrant. Remove from the heat.
Cook the ravioli. Boil gently in salted water for approximately 3–5 minutes, or until the pasta is tender and cooked through.
Finish and serve. Transfer ravioli to the brown butter sauce, add a little pasta water if needed, and coat gently. Serve immediately with sage and optional Parmesan.