For the brownies 200 g | 7oz | 7/8 cup unsalted butter 200 g | 1 1/3 cup chocolate chips (or chopped chocolate) 200 g | 1 cup soft light brown sugar 4 large eggs zest of 1 orange 5 tbsp mincemeat (optional) 125 g | scant 1 cup plain flour 50 g | 1/4 cup cocoa powder 2 tsp ground cinnamon 1/4 tsp ground cloves 1/2 tsp salt For the glaze 85 g | 3oz icing sugar 1 tbsp milk more if needed a couple drops vanilla extract Green food colouring (optional) sprinkles to decorate chocolate fingers , halved, for the tree ‘trunks’