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Heat oven to 180C/160C fan/gas 4. Heat half the oil in a pan and gently soften the onions and garlic for 15-20 mins until really soft and sticky but not browned. Put the onions, tomatoes (halve the large ones), herbs, sugar and breadcrumbs in a baking dish, season well and toss together.
Drizzle with the remaining oil, scatter with a few more herb sprigs and bake for 1 hr until going golden on top and the tomatoes are juicy.