Sauté cubes of aubergine in a pan over a medium heat with olive oil, 3 chopped cloves of garlic, and salt and pepper. Stop cooking when they are tender and cover with a lid to keep them moist. Cook the peppers over a medium heat in a sauté pan with the chopped onions, balsamic vinegar, a dash of water, caster sugar, olive oil, rosemary. Once suitably sautéed, remove from the heat and allow to cool in the pan with the lid on. Sauté courgettes in a pan over a medium heat with 3 cloves of peeled and chopped garlic, some olive oil, chopped thyme, salt and pepper. Cook gently until lightly coloured and soft. Allow to cool in the pan with a lid on and reserve. Combine all of the ratatouille ingredients in a large saucepan and reheat gently until warm.