Mix the tuna, mango or papaya, celery, 2/3 of the carrots, spring onions and red onions in a bowl. Mix Miracel Whip and Curry in a small bowl, then carefully fold into the tuna mixture. Cover and chill (preferably overnight).
Arrange the lettuce in a serving bowl lined with lettuce leaves or as finger food in individual lettuce leaves and sprinkle the remaining carrots on top.