Clean the broccoli and separate the florets. Cut the onions into fine cubes.
Bring water to a boil in a large saucepan. Add 1 teaspoon of salt to the boiling water, then the pasta and broccoli. After about 2 minutes, skim off the broccoli and place in a pasta colander.
Cook the noodles al dente, then pour them over the broccoli into the noodle sieve.
Briefly dry the inside of the pot with a kitchen towel or tea towel, then add 1 tablespoon of oil to the pot. Fry the onion cubes until translucent. Add the crème fraîche and milk to the onions. Season with salt, pepper, nutmeg and vegetable stock powder and stir well.
Add the pasta and broccoli to the sauce, stir well and let it heat up briefly.