Pressure cooker pulled pork

For the spice rub

• 2 tbsp soft light brown sugar
• 1 tsp coarsely ground sea salt
• 1 tsp dry mustard powder
• 1 tsp onion granules
• 1/2 tsp cayenne pepper or ancho chilli powder
• 1/2 tsp sweet smoked paprika
• 1/2 tsp ground coffee (not instant)

For the pulled pork

• 1.6 kg | 3 1/2 pound pork shoulder
• 2 tbsp light olive oil
• 100 g | 3.5oz ketchup
• 60 ml | 2fl oz cider vinegar
• 200 g | 7oz crushed pineapple from a 400g/14oz tin
• 60 ml | 2fl oz of the pineapple juice
• 3 tbsp rum
• 1 tbsp honey
• 1 tbsp soy sauce
• 1 tbsp Worcestershire sauce 
• 1/4 tsp ground black pepper
• 1 tbsp cornstarch diluted in 1 tbsp cold water

To serve

• Milk buns
• coleslaw
• Pickles