Bring up to the boil, cover and simmer for 20 minutes, removing the lid for the final 5 minutes, and allow to reduce until it thickens. Alternatively you could add a very small amount of xanthan gum at this point and stir it in well. By adding a tiny amount at a time you will be able to thicken it as much or as little as you want.
Spoon the mashed potato onto the mince, and run a fork over the top to cover the mince and give it some texture. Alternatively you could pipe the potato on to the top.
Place in a pre heated oven (200-220°C) and cook for 25-30 minutes or until golden brown.
Serve with a selection of vegetables and some pickled beetroot and red cabbage.