I found some interesting recipes in the free Asda magazine, using pineapple. It is unfortunate that they all seem to have sugar as well, which seems silly when pineapple is quite sweet anyway.
This one is using pork fillet or loin steaks; I replaced the sugar with honey for the marinade.
100ml pineapple juice
2 tbsp honey
2 tbsp cider vinegar
3 tbsp lime juice
1 tbsp olive oil
600g pork fillets/loin steaks
300g pineapple, fresh or tinned, cut into small pieces
1 red chilli, deseeded and finely chopped
3 spring onions, chopped finely
2 tbsp fresh coriander
Put pineapple juice, honey, vinegar, 1tbsp lime juice and oil in a bag.
Add pork and toss to coat.
Leave to marinade for 2-3 hours, turning occasionally.
Mix pineapple, chilli, spring onions, 2 tbsp lime juice and coriander to make a salsa, and chill.
Take pork from marinade and grill, turning regularly. Destroy marinade.
Serve with sweet potato mash and vegetables.