Preheat oven to 350°. Spray an 8x3-inch round cake pan with baking spray with flour. Line pan with parchment paper, and spray again.
In a large bowl, beat butter and sour cream with a mixer at medium speed until creamy. Add brown sugar, beating until mixture is fluffy. Beat in molasses. Add eggs, one at a time, beating well after each addition.
In a medium bowl, stir together flour, cocoa, baking soda, pumpkin pie spice, and ginger. Gradually add to butter mixture, beating until mixture is smooth. Pour batter into prepared pan.
Bake until a wooden pick inserted in center of cake comes out clean, about 1 hour, covering cake with foil halfway through baking to prevent excess browning, if necessary. Let cool in pan for 10 minutes. Remove from pan, and let cool completely on a wire rack. Top cake with Wine-Poached Pears, drizzle with Butterscotch Sauce, and sprinkle with Chocolate-Covered Walnuts.
Recipe by Victoria at https://victoriamag.com/ginger-cake-wine-poached-pears-recipe/