Ham hock & pistachio roll - Good Food Middle East

Ingredients

• 2 smoked ham hock (about 3kg in total)
• 2 carrots, roughly chopped
• 1 onion, roughly chopped
• 1 leek top, if you have it, roughly chopped (optional)
• 2 celery sticks, roughly chopped
• 2 bay leaves
• 1 thyme sprig
• 2 cloves
• 1 allspice berry
• 1 tbsp apple cider vinegar, plus a splash
• small pack parsley, leaves chopped, stalks reserved
• 80g shelled and toasted pistachio
• 2 Granny Smith apples
• 1 shallot, thinly sliced into rings
• 2 tbsp apple cider vinegar
• 40g bag pork scratchings, lightly crushed
• 2 tbsp English mustard
• 4 tbsp extra virgin rapeseed oil, plus extra for brushing (optional)