The problem with leftovers is that they can easily look like exactly that but this crafty way with cooked ham - an anglicised version of the French jambon persillé - looks like you've made it from scratch*. If you want it to look really fancy you can make it in a loaf tin and unmould it but I reckon that's far too much of a faff at this time of year.
Although I've given quantities you can adjust them depending on how much ham you have over. Or replace some of the ham with cold turkey as per the original recipe in the Frugal Cook book. You may not need all the stock.
Serves 4-6 depending what else you're serving.
450-500g piece of cooked ham
4 tbsp dry white wine (a neutral white like Pinot Grigio or Chablis is ideal)
6 sheets of fine leaf gelatine (or whatever amount is recommended to set 500ml of liquid)
425ml strained ham stock
A large handful of curly or flat leaf parsley
Freshly ground black or white pepper
A pinch of mace (optional)
You'll also need a medium sized (about 1.2 litres) bowl
Put the wine into a shallow dish, add the gelatine and leave for about 10 minutes until the gelatine softens. Heat the ham stock, remove from the stove and stir in the gelatine until dissolved. Leave to cool for 30 minutes.
Remove any fat from the ham and cut into largeish chunks about 2cm square. Finely chop the parsley and mix with the ham. Season with pepper and mace (no salt - the ham should be salty enough.)
Pour half the cooled stock into the bowl, mix in half the ham and parsley mixture and refrigerate until it just begins to set. Add the remaining ham and stock** and refrigerate for a further couple of hours.
* Of course you can make it from scratch. A ham hock should contain just about enough lean meat to make a small terrine.
** If the stock has jellied you can warm it again gently.