Place mayonnaise and curry powder in a small bowl, stirring until curry powder is completely incorporated. Add tuna, garlic, celery, raisins and chives, stirring to combine. Season with salt and pepper.
Scoop seeds and flesh from inside tomatoes and discard.
Arrange endive leaves on salad plates. Spoon tuna mixture into tomatoes and place 2 halves on each plate. Serve immediately.