Put some water in a pot and boil the potatoes for five minutes, just to get them started. Not the sweet potatoes though. Leave aside until ready to use them.
In a separate pot maybe a deeper frying pan put the oil, the chopped onions and leek and sweat for 5 min or so. Add the green beans, the chopped carrots, the courgettes, celery stalks and the sweet potato chopped into small cubes, the kale and cook for 8-10 min on a medium heat stirring occasionally. Season well with salt,pepper and herbs of your choice, liking and availability.
Drain the potatoes of the water and add to the pie along with the fish cubes.
Add the coconut or the cow milk and cook for a good 8-10 min stirring a few times.
Add the double cream the nutmeg and cook on a really low heat for 5 min.
Serve hot and sprinkle some fresh herbs.