- 15 cups all-purpose flour
- 3 tablespoons kosher salt
- 3 tablespoons baking soda
- 3 tablespoons ground cinnamon
- 4 teaspoons ground nutmeg
- 2 teaspoons allspice
- 2 teaspoons ground cloves
- 12 cups white sugar
- 12 cups cooked and mashed sweet potatoes
- 16 eggs
- 4 cups vegetable oil
- 3 cups orange juice
- Preheat oven to 300 degrees F (150 degrees C). Grease and lightly flour 2 sheet cake pans.
- Mix flour, salt, baking soda, cinnamon, nutmeg, allspice, and cloves together in a large bowl.
- Beat sugar and sweet potatoes in a bowl using an electric mixer until smooth and creamy. Add eggs, oil, and orange juice; beat until well combined.
- Pour flour mixture into potato mixture and beat for 4 minutes, scraping down the sides of the bowl twice. Pour batter into prepared sheet cake pans.
- Bake in the preheated oven until a toothpick inserted into the center comes out clean, 60 to 90 minutes.