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Move rack to the center of the oven and preheat to 350 degrees F. Line a 9 x 2-inch round or two 6 x 2-inch round cake pans with parchment; butter or grease parchment and the sides of the pan.
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In a large bowl, whisk to combine the molasses, sugar, and oil (the oil will float to the top). In a medium bowl, combine the flour, cinnamon, ground ginger, cloves, and pepper.
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Bring 1 cup water to a boil in a medium saucepan. Add the ginger to blanche, and then stir in the baking soda. It will foam up considerably, so be ready to stir in the soda and then quickly whisk it into the wet ingredients. Whisk the dry ingredients into the wet, beat in the eggs, and whisk until everything is well incorporated.
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Pour batter into cake pan(s) filling 3/4 full – scrape any leftover batter into a greased ramekin to make a personal test cake. Tap the pan(s) on the counter to dislodge bubbles. Bake cake(s) 50 - 60 minutes (if making 6-inch cakes, check at the 45 minute mark), or until a toothpick inserted in the middle comes out with just a few crumbs attached.
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Cool 15 minutes in the pan, then flip out onto a wire cooling rack to let cake(s) cool completely.
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When ready to serve, whip the cream to soft peaks, add 2 tablespoons molasses, and whip to combine; then drizzle in the second half and just barely stir so the cream is streaked with ribbons of molasses. Dollop on the cake(s), slice, and serve.
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Cake can be cooked, cooled, and then wrapped in parchment and plastic wrap for several days, or frozen. Make whipped cream just before serving. Uneaten portions can be kept, wrapped loosely in plastic, in the fridge.