Thomas Jefferson's Sweet Potato Biscuits

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5 cups all-purpose flour

1 cup packed light brown sugar

2 tablespoons baking powder

1 1/2 teaspoons ground cinnamon

1 teaspoon salt

1 teaspoon ground ginger

1/2 teaspoon ground allspice

1 cup solid frozen vegetable shortening

2 cups roasted, mashed, and cooled sweet potatoes

1 cup heavy cream (plus more if needed)

1/2 cup coarsely chopped pecans