Curried Tofu Salad

3 tablespoons low-fat plain yogurt

2 tablespoons mayonnaise

2 tablespoons mango chutney prepared

2 teaspoons Madras hot curry powder. preferably

¼ teaspoon salt

black pepper, to taste

1 x 14 ounce extra-firm tofu, package, water-packed, drained, rinsed and finely crumbled

1 cup red grapes, sliced in half

½ cup scallions, sliced

¼ cup chopped walnuts

2 stalks celery, diced