For the pasta casserole with pumpkin, briefly roast the bacon cubes without fat and let cool. Season the pumpkin cubes with the juice of one lemon and salt, mix with the bacon cubes.
Cook pasta al dente on the stove and strain.
Mix pumpkin, pasta, sage, cream and gorgonzola, season and pour into a buttered baking dish.
Bake the pasta casserole with pumpkin in a preheated oven at 220° Celsius for 40 minutes.