Put all the ingredients for the meatballs in a bowl, season with freshly ground pepper and mix the mince thoroughly. Leave the mixture to rest for 15-20 minutes.
Meanwhile, cut the cabbage into quarters and place the pieces in an ovenproof dish, cut side up. Oil the base of the dish lightly – or line it with a piece of baking parchment.
Drizzle the cabbage with oil, season with salt and freshly ground pepper, and roast in an oven preheated to 220°C, conventional oven (top and bottom heat), for about 20-25 minutes.
Melt a generous knob of butter in a frying pan and let it foam up. Shape the mixture into meatballs: dip a spoon in hot water, scoop up a spoonful of the mixture and shape it into a meatball between the spoon and the palm of your hand.
Fry the meatballs until golden on both sides and cooked through in the middle – about 5 minutes on each side over a medium heat.
Meanwhile, put the feta in a mini chopper with the yogurt, garlic and lemon juice. Blitz until you have a smooth, even cream, then season to taste with salt and freshly ground pepper.
Spread a couple of generous tablespoons of whipped feta over each of 4 plates and set the cabbage on top. Arrange the meatballs alongside and serve with freshly baked bread and, if you like, a scattering of parsley.