Heat a frying pan over a low heat and gently toast 8 whole allspice berries, 5 tsp whole black peppercorns, 1 cinnamon stick and 2 tsp whole coriander seeds, shaking the pan occasionally. Remove from the heat when the aroma of the spices has been released.
Add the toasted spices to a mortar and pestle and crush until it forms a grainy powder.
Place the spices into a food processor and blitz until a paste has formed.
This can be stored in a jar in the fridge for up to two weeks, or divide into portions and freeze for up to 3 months, defrosting when needed.
for the pulled pork
The night before, combine half 1 portion jerk marinade with 0.5 tbsp instant coffee granules dissolved in 1 tbsp hot water and the juice of 1 large orange. Massage deep into the scored flesh of 1.8 kg rolled pork shoulder and place into your slow cooker pot along with 8 spring onions, chopped, 8 garlic cloves, crushed, 1 fresh red chilli, finely chopped, 8 bay leaves, 2 tbsp demerara sugar, 2 tbsp Shetland sea salt, 5 tsp fresh thyme leaves, 2 tsp freshly grated nutmeg, 1 tbsp fresh ginger root, grated, 3 tsp runny honey, the juice of 1 lime, 2 tsp Scottish rapeseed oil and 1 tsp soy sauceover, and leave to marinade in the fridge until the following day.
Cook the pork on low for 8-10 hours. When cool enough to handle, remove the meat from the pot, shred with two forks, cover and set aside. Reserve any juices in the pot.
Just before you are ready to serve, heat the remaining jerk marinade in a small saucepan until the spices release their aroma. Mix with the juice of 1 large orange and any juices at the bottom of the slow cooker pot and bring to the boil. Leave to simmer for a few minutes to reduce.
Pour the dressing over the pulled pork, tossing to make sure everything is well coated. The pork can be frozen at this stage, or chill it for a few days if you've got a BBQ coming up and reheat on the BBQ.
To serve, arrange 100 grams watercress on a platter and scatter with 1/4 large watermelon, cubed, seasoned generously with Shetland sea salt and freshly ground black pepper (use a lot!). Add the pulled pork and gently toss together.