Divide the sausages in the middle on the long side and place them on a plate with the flat side down.
Cut small cuts over across the short side of the sausages.
Cut the tomatoes in thin slices and place them on the same plate as the sausages.
Grate the cheese and place in the middle of the sausages and tomatoes.
Mix the oil, vinegar and salt and pepper in a small bowl and sprinkle over the cheese, tomatoes and the sausages.
Serve cold as a starter or a light lunch.