Peel and chop the onions. Heat the oil in a large pot. Fry the onions in it until transparent. Add marjoram. Deglaze with 2 l water. Stir in broth and add peas. Bring everything to the boil, cover and simmer for about 50 minutes
Take 2 tablespoons of peas from the broth and set aside. Mash the rest of the peas in the broth. Stir in frozen peas and 150 g cream and simmer for about 5 minutes
Cut salmon into strips. Add to the soup with set aside peas. Season with salt, pepper and sugar. Lightly whip 50 g cream. Arrange soup with cream and possibly marjoram