1 Preheat the oven to 350° F.
Lightly grease a 9" x 9" x 2" baking pan.
In the pan, stirtogetherthe butter, brown sugar, and lemon juice, then spread the mixture evenly over the bottom.
Arrange the pineapple rings on top.
2 Into a medium-size bowl, sift together the flour, cornstarch, cinnamon, ginger, baking powder, baking soda, and salt.
In a large bowl, whisktogetherthe molasses, granulated sugar, oil, and egg whites.
3 Add half of the flour mixture and half of the milk to the molasses mixture and stir just until blended.
Repeat with remaining flour and milk, taking care not to overmix.
Pourthe batter into the prepared pan, spreading it evenly over the fruit.
Bake for 35 to 40 minutes or until a toothpick inserted in the center comes out clean.
Set the pan upright on a wire rack and let cool for 5 minutes, then invert onto a serving platter.