Drain the roasted peppers. Peel onions and garlic and dice finely. Cut Cabanossi into slices.
Heat the oil in a large pot. Fry the cabanossi briefly in it and take it out. Sauté onions and garlic in hot frying fat. Stir in tomato paste, sweat briefly. Deglaze with tomatoes and juice and 1⁄2 l water.
Add roasted peppers and stock, bring to the boil. Simmer for about 5 minutes.
In the meantime, clean, wash and finely dice fresh peppers. Puree the soup with a hand blender. Season to taste with salt, pepper, sugar and paprika. Warm up the cabanossi slices and paprika cubes briefly.
Arrange the soup and crumble the feta over it.