Preheat the oven to 180˚C/350˚F. (convection oven)
Cook the celeriac until soft. Drain and lightly steam. Mash and season with salt and pepper.
Heat a large frying pan with 1 tbsp of coconut oil. Sauté the onion until translucent, then add the mince and garlic. Fry the mince until tender, then add the diced tomatoes and tomato puree to the pan.
Season the tomato mixture with chilli flakes, oregano, thyme, salt and pepper. Pour into the bottom of an ovenproof dish.
Spread the sauerkraut over the mince and top with the celeriac puree.
Sprinkle the celeriac with almond shavings and bake in the oven for about 30 minutes.