Heat oven to 350 degrees F.
Lightly grease a 9 x 9 inch baking pan. Toss pears, orange juice, orange zest, sugar, allspice, cinnamon, and ginger in a medium bowl. Pour into prepared baking pan.
In a small bowl, combine flour, brown sugar, and oats. Cut in butter and mix until it resembles coarse crumbs. Sprinkle over pears. Top with cinnamon.
Bake for 40 to 45 minutes until top is golden brown and pears are bubbling.
Mix whipped cream, vanilla, powdered sugar, and ginger.
Take out pear crisp and let cool. Serve warm or at room temperature. Top with ginger whipped cream.