Preheat the oven to 180c (fan)
Grease a (I use a 20cm fluted tart tin) but any 20cm shallow sandwich tin will do.
Tip the walnuts and flour into a food processor and blitz until breadcrumbs.
Either in a stand mixer or with an electric whisk beat the butter and sugar together until pale, add the eggs one at a time then the ground walnuts and flour. Stir through the vanilla extract and a pinch of salt.
Spoon half the mixture into the tart tin then spoon over a layer of mincemeat and cover with the rest of the mixture.
Bake in the oven for about 40-45minutes, or until a skewer comes out clean.
When the cake has cooled enough to take out of the tin put on a lovely serving plate. Serve warm or room temp.
