Rinse the rice in a sieve under cold running water until it is clear. Drain well. Cook the rice and beans in boiling salted water for approx. 15 mins. until just soft, drain, rinse with cold water.
In a bowl, mix the balsamic with all the other ingredients up to and including the salt. Stir in the rice and beans. Sprinkle with the coriander and nuts.
Grill the pineapple slices over/on a medium heat (approx. 200 °C for approx. 5 mins. on each side, serve with the rice salad.