Marinate the tuna cubes with the salt, vinegar and calamansi juice for at least 45 minutes. Turn the tuna cubes every 15 minutes so they will cure evenly.
Add all the other ingredients except the coriander leaves and marinate a further 30 minutes.
Remove the tuna from the marinade and place on the serving dish. Pour over some of the liquid with the all vegetable julienne and garnish with additional coriander leaves.