Wash the sage, dab dry, remove the leaves and chop. Peel garlic and cut into thin slices. Peel and chop onion. Heat 1 tablespoon of oil in a saucepan. Sauté onion and garlic.
Add tomatoes, bring to the boil and simmer for about 15 minutes. While doing so, crush the tomatoes with a spatula. Stir in sage. Season to taste with salt, pepper and sugar.
Pour the beans into a sieve, rinse with cold water and drain. Add the beans to the tomato sauce and cook for about 10 minutes on a low heat.
Heat 1 tablespoon of oil in a frying pan. Fry the salsicca in it for about 6 minutes. Serve the beans with toamt sauce and salsicca. Ciabatta tastes good with it.