2 cups all-purpose flour
1/2 cup granulated sugar
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
6 tablespoons chilled unsalted butter, cut into pieces
1/3 cup roughly chopped crystallized ginger (Australian ginger is best)
3/4 cup buttermilk
1 egg, lightly beaten
2 large, ripe mangoes, peeled and cut into cubes
1/2 pound strawberries, stemmed and sliced
8 ounces lowfat vanilla yogurt, stirred to make smooth