Ask, and it will be given to you; seek, and you will find. Even in an extremely urbanised city like Delhi, with hardly any real wilderness left, you will be pleasantly surprised how nature escapes the boundaries we set for her. Plants like bathua (lamb’s quarters) and kulfa (purslane) are common enough. I even found a large patch of sotchal (common mallow) growing wild in Purana Qila one time.
Last year K, my house help, put before me a bag of citrus growing on an unoccupied plot in her colony that no one wanted and was only attracting monkeys and their destructive antics. It looked a lot like our santara, the regular Indian orange; the peel and sections were on point. But there was nothing orange-y about their juice. The juice was sour and bitter, in equal measure. Loathe to see beautiful fruit laid waste she brought me a few confident that I would be able to make something of them.