Clean, wash and drain the spinach. Pour into boiling water, bring to the boil briefly, pour into a sieve and drain well. Peel and finely chop the onion. Peel garlic and chop finely.
Put the pasta in boiling salted water and cook for about 10 minutes. In the meantime, squeeze out the spinach and chop coarsely. Heat oil in a large pan, fry onion until translucent, add garlic and fry briefly.
Add the spinach, deglaze with stock and cream, bring to the boil and stew for 2-3 minutes at low heat. Stir in parmesan. Dice the gorgonzola, stir into the spinach and stir until the cheese has melted.
Season to taste with salt and pepper. Pour the pasta into a sieve, rinse and drain briefly. Arrange noodles and sauce on plates. Serve garnished with young spinach leaves as desired.