Finely chop the onion and garlic and cut the bell pepper into small pieces. Fry the mixture in a frying pan until the onion is translucent and add the tomato puree. Sauté for a while and then add the tomato cubes. Let the sauce simmer for about 30 minutes. After that, finely blend the sauce with an immersion blender.
Meanwhile, cook the spaghetti according to package directions. Heat the Garden Gourmet Vegetarian Balls in the sauce for a few minutes until they are warm.
Cut the olives into rings and cut the 'white of the eyes' from the cheese slices. Cover the balls with slices of 'white of the eyes', with the black olive rings on top. Garnish the plates with Halloween decorations.
Add the spaghetti to the plate with some tomato sauce and the 'meatballs'. Top it off with the eyes made from the cheese and olives and serve some extra sauce on the side. Garnish with Halloween decorations.