Brown mince and onions in a pan, then add tomatoes, garlic, flour, stock, cinnamon, tomato pure and seasoning. Transfer to slow cooker. Lay the aubergine and potato on top to cover the sauce.
Cook on low for 8 hours.
For the topping, mix the ingredients together in a bowl and then pour over the top of the aubergines, use a spatula to ensure total coverage, grate nutmeg on top if desired.