Preheat oven to 350 degrees.
In a food processor, pulse brown sugar, flour, butter, ground cloves, nutmeg, cinnamon, ginger, and salt until crumbly.
In a medium bowl, stir together boiling water and baking soda and allow to stand for 1 minute. In another bowl, stir together both syrups, vanilla, and the egg. Pour egg mixture into the baking soda and water.
Sprinkle half of the flour mixture over the bottom of the crust. Pour syrup mixture over the flour mixture. Sprinkle the remaining crumb mixture over the filling.
Bake for 40 to 45 minutes or until set. Remove from oven and cool on a cooling rack allowing it to completely. Serve with whipped cream.