Asparagus and Tomato Salad

1 bunch asparagus, steamed, chilled and chopped
2 tomatoes, chopped
4 tablespoons plain yogurt
1 tablespoon dijon mustard
1 tablespoon grated parmesan cheese

In a medium bowl, mix together the yogurt, mustard and cheese. Add chopped asparagus and tomatoes and toss. Serve cold alone or as a side dish. Yields: 4 servings