Gingerbread Cake

Name: Gingerbread Cake
Prep time: 25 min
Cook time: 45 min
Total time: 1 h 10 min
Yield: 12
Ingredients: 2 tsp Ginger, ground; 1 Egg yolk, large; 2 Eggs, large whole; 3/4 cup Molasses, traditional; 2 1/2 cups All-purpose flour; 1/2 tsp Allspice; 2 tsp Baking powder; 1 tsp Baking soda; 3/4 cup Brown sugar, dark; 2 tsp Cinnamon, ground; 1/4 tsp Cloves, ground; 1/2 tsp Nutmeg, ground; 1 3/4 cups Powdered sugar; 1/2 tsp Salt; 3 1/2 tsp Vanilla, pure; 7/8 cup Vegetable oil; 1/4 cup Butter, unsalted; 1 1/8 cup Buttermilk; 5 tbsp Sour cream