Pumpkin clean, wash and cut into fine cubes. Peel and finely dice the onion. Peel garlic and chop finely. Heat oil in a pot, fry onions and garlic in it, add pumpkin, fry briefly.
Deglaze with broth, bring to the boil and cook over medium heat for about 18 minutes. In the meantime, wash the cucumber and slice into very fine strips. Pour the shrimps onto a sieve and drain well. Put the noodles in boiling salted water and cook for about 9 minutes.
Add the cucumber strips 2 minutes before the end of the cooking time. In the meantime, take off a tablespoon of pumpkin cubes and put them aside. Puree the rest of the pumpkin. Stir in cream, bring to the boil again, season with salt, pepper and sugar.
Meanwhile melt the fat in a pan, sauté the shrimps briefly in it and add to the sauce. Drain the noodles. Arrange noodles and sauce in deep bowls. Sprinkle with pumpkin cubes and seeds put aside.
Serve garnished as desired with nasturtium blossoms.