Use pineapple canned in unsweetened pineapple juice.And avoid red cabbage which has been sitting around in the supermarket too long. This can taste bitter,
1 cup of red cabbage ( shredded)
1/2 spring onion (finely chopped)
1/4 red pepper (diced)
6 cubes of pineapple ( each quartered)
Mix together. If it looks a little dry add a tablespoon or two of the pineapple juice.