Slow Cooker Pulled Pork

Name: Slow Cooker Pulled Pork
Ingredients: * 400g tinned chopped tomato; * 1 onion, diced; * 4 garlic clove, crushed; * 170g tomato paste; * 230ml beef stock; * 2 tbsp dijon mustard; * 2 tbsp apple cider vinegar; * 1 tbsp olive oil; * 2 tbsp smoked paprika; * 1 tsp sea salt; * 1 tsp cayenne pepper; * 220g tinned pineapple, diced; for the spice rub; * 4 tbsp smoked paprika; * 2 tbsp sea salt; * 2 tbsp chilli powder; * 2 tbsp ground cumin; * 1 tbsp ground black pepper; * 1 tbsp dried oregano; * 1 tbsp ground white pepper; * 2 tsp cayenne pepper; for the pulled pork; * 3.5kg pork shoulder; * 2 white onion, thinly sliced