Magic Cake | Cooking Professionally

Ingredients

• 4 large eggs, at room temperature, yolks and whites separated
• 1 tablespoon water
• 3/4 cup sugar
• 8 tablespoons unsalted butter, melted
• 1 teaspoon vanilla extract
• 1/8 teaspoon salt
• 6 1/2 tablespoons all-purpose flour
• 6 tablespoons cocoa powder
• 2 cups milk, warmed to about 95 degrees F
• 1 teaspoon regular white vinegar