Chocolate Bundt Cake - Once Upon a Chef

Ingredients

• ½ cup coffee ((any temperature is fine))
• 4 oz semi-sweet chocolate, (coarsely chopped)
• ¾ cup buttermilk
• 4 large eggs
• 2 teaspoons vanilla extract
• 2⅔ cups all-purpose flour, (spooned into measuring cup and leveled-off)
• ⅓ cup natural cocoa powder, (such as Hershey's)
• 2 cups granulated sugar
• 1 teaspoon salt
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• 1 cup (2 sticks) unsalted butter, softened
• 4 tablespoons unsalted butter
• 2/3 cup granulated sugar
• 3 tablespoons water
• 1½ teaspoons vanilla extract
• 2 tablespoons unsalted butter
• 1½ oz unsweetened chocolate, (coarsely chopped)
• ¾ cup confectioners' sugar
• 2 to 3 tablespoons hot water