Old Fashioned Red Velvet Cake

Ingredients

• ½ cup (1 stick or 113g) unsalted butter (at room temperature)
• 1 ½ cups (315g) sugar
• 2 large eggs (at room temperature)
• 1 teaspoon vanilla extract
• 1 Tablespoon (8g) cocoa powder
• 2 ¼ cups (290g) all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon salt
• 1 cup (242g) buttermilk (at room temperature)
• 2 oz (56g) liquid red food color
• 1 teaspoon white vinegar
• 3 Tablespoons (30g) cornstarch
• 1 ½ cups (325g) water
• 1 ½ cups (3 sticks or 339g) unsalted butter (at room temperature)
• 2 teaspoons vanilla extract