1 courgette, chopped into 1cm/½in chunks
2 garlic cloves, finely chopped or crushed
1 onion, chopped
1 pepper (any colour), deseeded and chopped into 1cm/½in chunks
2–3 sprigs rosemary or thyme (alternatively use ½ tsp dried herbs)
1 x 400g/14oz can chopped tomatoes
1 tsp Worcestershire sauce
black pepper (optional)
1 tspspoon tomato purée
2 tsp vegetable oil
400g/14oz mini chicken fillets
1 tsp vinegar (balsamic or red wine)