Baked Alaska Sandwich from The Vintage Baker: More Than 50 Recipes from Butterscotch Pecan Curls to

Ingredients

• ½ tsp baking soda
• ½ cup [100 g] granulated sugar
• ½ cup [100 g] packed dark brown sugar
• 6 Tbsp [30 g] Dutch-process cocoa powder
• ¾ cup plus 2 Tbsp [125 g] all-purpose flour
• 1½ tsp espresso powder
• ½ cup [120 ml] boiling water
• ½ cup [120 ml] buttermilk, at room temperature
• ¼ cup [60 ml] vegetable oil
• 1½ tsp pure vanilla extract
• 2 egg yolks
• ½ tsp table salt
• Rounded ¾ tsp baking powder
• 3 pt [1.4 L] ice cream, such as strawberry, chocolate, and vanilla
• 6 egg whites, at room temperature
• 1 cup [200 g] granulated sugar