Drain the corn. Peel and finely chop the onion. Heat oil in a pot and fry diced onion until transparent. Wash the chilli pepper, dab dry and cut into fine rings. Add to the onion cubes and steam. Add tomatoes and drained corn. Season with salt, ketchup and mustard and cook over medium heat for 6-8 minutes
Cook the spaghetti in plenty of boiling salted water for about 10 minutes until al dente. Cut Cabanossi into fine slices. Serve pasta with the sauce. Sprinkle slices of cabanossi on top and garnish with some flat parsley if desired