Combine water and rice in a medium saucepan. Bring to a boil. Cover, reduce heat, and simmer for 45 to 50 minutes. Cool.
Heat butter in a skillet over medium heat. Cook onion and celery in butter until tender, stirring frequently. Season with curry powder, and continue cooking for one minute.
In a large bowl, mix together yogurt, lime juice, lime zest, and sugar. Stir in rice, onion and celery mixture, chopped kiwi, ham, cheese, nuts, and mushrooms. Arrange sliced kiwi over salad.
