Preheat the oven to 200°c.
Mix together the tomato puree, balsamic vinegar, water, basil, oregano and garlic in a small bowl to make the sauce. Season with salt and pepper to taste.
Slice the finger roll in half lengthways and spread the sauce onto the rolls. Sprinkle over the cheese.
Place into the oven for 5 minutes until the roll is toasted and the cheese has melted.
Serve with an accompaniment of your choice.