Preheat the oven to 200 degrees Celsius or 400 degrees Fahrenheit.
Cut the pineapple in half lengthways, cut out the core and discard. Scoop out most of the flesh, leaving some inside, then cut into small dice and drain off any excess juice.
Put the pineapple halves onto a baking tray, cut side up, and roast for 10 minutes until softened. Meanwhile bring the stock to the boil, pour over the bulgar wheat and cover with clingfilm.
Leave to stand for 15 minutes then remove the clingfilm and fluff the grains with a fork. Whilst the bulgar wheat is soaking, heat a little olive oil in a saucepan, add the onion, garlic and chilli and sweat gently for 5 minutes until soft. Increase the heat, add the okra and cook for 2 minutes.
Add the wine, bring to the boil and cook for a further 2 to 3 minutes. Add the prawns, cook quickly until just pink then remove from the heat.
Stir through the pineapple, bulgar wheat, lime juice and herbs then divide the mixture between the pineapple halves. Sprinkle with parmesan cheese and place under a hot grill for 2 to 3 minutes until golden brown and bubbling.
Leave to cool for a minute before serving.