Finely chop onion and garlic. Put in pan;add herbs tomatoes and puree and a pinch of sugar.bring to boil then simmer for 5 mins. Preheat oven 180 degrees c.
Meanwhile slice ciabatta in half. Grate cheeses and mix. Prepare any extra toppings
Place ciabatta on baking tray. Spread generously with tomato sauce, top with cheese and toppings of your choice.
Bake for 5/10 mins or until cheese is bubbling. Serve with baked potato or salad.