Molasses & Rum BBQ Pork Skewers

600g boneless Specially Selected Pork loin, cubed

4 red onions, quartered

1 tbsp rapeseed oil

4 spring onions, whites only (finely chopped)

¼ tsp garlic powder

¼ tsp fennel seeds, crushed

½ tsp coriander seeds, crushed

½ tsp ground ginger

¼ tsp cayenne pepper

70g tomato puree

1 tbsp apple cider vinegar

½ tsp Worcestershire sauce

¼ tsp English mustard

1 dash Angostura bitters

½ lime, juice only

1 tsp orange zest

25 ml good quality dark rum

3 tbsp treacle

12 wooden skewers, soaked in warm water for 20 minutes