Ice Cream Cake Roll

Ingredients

• 4 large eggs, separated
• 3 tablespoons (40 grams) granulated sugar
• heaped 1/8 teaspoon fine sea or table salt
• heaped 1/8 teaspoon cream of tartar (see note)
• 1/3 cup (65 grams) packed dark brown sugar
• 1 1/2 teaspoons pure vanilla extract
• 1 1/2 tablespoons water
• 1/4 cup (20 grams) dutch-process cocoa, plus more for dusting (see note about using black cocoa)
• 1/3 cup cake flour (40 grams) or 5 tablespoons all-purpose flour plus 1 teaspoon cornstarch
• heaped 1/2 teaspoon baking powder
• 2 to 2 1/4 cups slightly softened ice cream of your choice (i used cookies and cream)
• powdered sugar, hot fudge sauce, whipped cream, sprinkles, or all of the above to garnish