Cook the spaghetti in boiling salted water for 12 minutes. Put tomatoes briefly in boiling water. Quench, peel skin and dice the tomatoes. Peel and finely chop the onion. Drain the beans on a sieve.
Heat the fat in a saucepan and sauté the diced onions and tomatoes. Add the chicken soup and bring to the boil. Add beans, mustard and cream and cook for 5 minutes at low heat.
In the meantime, cut the ham into cubes. Stir the sauce thickener into the sauce and bring to the boil. Season to taste with salt, pepper and savory. Add ham cubes to the vegetables. Serve spaghetti with the bean vegetables.
Garnish with parsley.