Place flour, semolina and egg yolks in the mixer. Work them with the dough hook until you see a ball formed around it. Add a few drops of water if needed.
Place a tablespoon of pumpkin filling on the pasta stripes, every 2 inches circa. Fold the dough over itself, vertically. Press with your fingers: all around the borders and between filling spots. Use a knife or a pasta cutter to nicely cut out extra dough.
Your pumpkin ravioli are ready.
Place butter and sage leaves in a small pan, and melt over low heat.
Cook the pumpkin ravioli in boiling salted water (1 teaspoon every 4 cups of water) until they float.
Season the ravioli with the sage and butter sauce and sprinkle them with grated parmesan cheese.