Cook the pasta in 3-4 l boiling salted water (approx. 1 teaspoon salt per litre) according to the instructions on the packet. Drain the tuna.
Clean, wash and cut patissons into pieces. Peel shallots and garlic, dice finely. Heat the oil in a large frying pan. Fry the patissons, shallots and garlic for about 5 minutes, turning them over.
Season with salt and pepper.
Add wine and 1/8 l water, bring to the boil and simmer for 3-4 minutes. Clean and wash spring onions and cut them diagonally into rings. Stir in broth, mascarpone and spring onions. Season to taste with salt and pepper.
Wash the marjoram, shake dry and remove the leaves. Drain the noodles and put them back into the pot. Mix with sauce, tuna and marjoram and heat up briefly. Season to taste with salt and pepper.