I dry fresh cranberries for mince pies and fruit cake, sprinkled with erythritol and stored in the fridge.
The mincemeat is made a couple of days in advance (or longer) with a little cooking apple pulp, some of the dried cranberries and plenty of spices - cinnamon, nutmeg, allspice, maybe a pinch of ginger, a little lemon juice plus a little more erythritol if needed.
Then I make mince pies with the base made with ground almonds and a little butter (pressed into the tin rather than rolled out.
No top layer.
Cook on 180C for about 16-18 mins and serve with real egg custard or double cream.
Not carb free but a reasonable compromise for me.
(You could use a stevia and erythritol mix instead but I find it overpowers the taste of the pies.)