Start by peeling and chopping potatoes and adding to boiling lightly salted water.
once cooked and soft (about 15-20 mins) drain and mash with a knob of butter, add a dash of milk if you want but this mash needs to be quite firm not sloppy.
finely chop and wash the greens and add to a pan of boiling salted water for about 20mins until tender. Drain really well squeezing out any excess water with a saucer.
Add to the mash potato and combine, if you want now add the finely chopped onion or leek. I prefer to fry this off until soft for a few minutes first.
now shape spoonfuls of the mixture into cakes and fry on both sides in a hot pan until crispy on each side.
If your mash is too sloppy this will not work and you will not be able to shape into cakes, you can however if this happens spoon into a dish and brown under a hot grill instead. Serve with sausages or a full fry up!