The Best Chocolate Cake

Cake

• 1 ½ cups flour(185 g)
• 1 cup dutch processed cocoa powder(120 g)
• 1 teaspoon salt
• 1 ½ teaspoons baking soda
• ½ teaspoon baking powder
• 1 ½ cups stout(360 mL)
• 1 tablespoon vanilla extract
• 1 tablespoon espresso powder
• 1 cup butter(235 g)
• 1 ½ cups sugar(300 g)
• 3 eggs
• ½ cup mayonnaise(120 g)
• 4 oz dark chocolate(115 g), chopped

Buttercream

• 1 ½ cups butter(350 g), softened
• 1 tablespoon vanilla extract
• ½ cup dutch processed cocoa powder(60 g)
• 5 cups powdered sugar(600 g)
• 5 tablespoons milk
• fresh fruit, to decorate