250g/9oz root vegetables, such as carrots or parsnips, peeled and thinly sliced or cut into roughly 1cm/陆in chunks
250g/9oz green vegetables, such as 1 courgette, halved and sliced, and 125g/4陆oz green beans, trimmed and cut into three
2 garlic cloves, crushed
1 onion, finely chopped
1 vegetable or chicken stock cube
400g tin chopped tomatoes
2 tbsp oil (any cooking oil will do)
1 tsp dried oregano
2 tbsp tomato pur茅e