Lay the pineapple on its side and cut lengthways down through the centre of the stem and leaves. Cut out the flesh, leaving each shell half intact. Cut the flesh into bite-sized cubes.
Melt the butter in a wok or heavy-based frying pan. Add the red onion and ham and stir-fry for about 30 seconds.
Add the pineapple, peas and sultanas and stir-fry for anot