Cook the rice according to the package instructions. Spread out onto a baking sheet to cool for 15 minutes before fluffing with a fork and transferring to a large bowl. Place in the refrigerator to cool completely for about 1 hour.
Add the mango and the pomegranate seeds to the bowl of rice and mix to combine.
Reserve the juice from the canned pineapple and chop the fruit into bite-size pieces. Add to the rice bowl and mix to combine.
Add the sweetcorn and stir again. You don't have to add all the ingredients in steps - I like to do it so that everything becomes really combined.
Add the chopped bell peppers, onion, chili, and fresh herbs if using to the bowl. Mix well.
Finally, add the chopped nuts to the bowl and stir to combine.
To make the dressing, pour all of the ingredients into a bowl or cup/jug and whisk together well.
Pour three-quarters of the dressing over the rice and other ingredients and mix well.
Cover and transfer to the refrigerator to chill for up to 24 hours. Place the remaining dressing in an airtight jar and place it in the fridge too.
Remove the Tropical Island Rice from the fridge about half an hour before serving to bring it to room temperature.
Shake the jar of dressing to recombine and pour over the rice. Mix together well.
Transfer to a serving dish and enjoy!