Millionaire's Shortbread

SERVES Makes 40 cookies

TIME 1¾ hours, plus 1½ hours cooling

WHY THIS RECIPE WORKS

Millionaire’s shortbread has a lot going for it: a crunchy shortbread base; a chewy, caramel-like filling; and a shiny, snappy chocolate top. The only thing that could make it better would be foolproof methods for producing all three layers. We started by making a quick shortbread with melted butter rather than pulling out the mixer or food processor. Sweetened condensed milk is important to the flavor of the filling, but it also makes the filling vulnerable to breaking because the whey proteins, crucial to keeping the mixture emulsified, have been damaged by heat both during processing and during the cooking of the filling. We added fresh cream to supply just enough whey to keep it together. Melting the chocolate very carefully so that it never got too hot and stirring in grated chocolate at the end created a smooth, firm top layer, which made a suitably elegant finish for this rich yet refined cookie. Millionaire’s shortbread has a lot going for it: a crunchy shortbread base; a chewy, caramel-like filling; and a shiny, snappy chocolate top. The only thing that could make it better would be foolproof methods for producing all three layers. We started by making a quick shortbread with melted butter rather than pulling out the mixer or food processor. Sweetened condensed milk is important to the flavor of the filling, but it also makes the filling vulnerable to breaking because the whey proteins, crucial to keeping the mixture emulsified, have been damaged by heat both during processing and during the cooking of the filling. We added fresh cream to supply just enough whey to keep it together. Melting the chocolate very carefully so that it never got too hot and stirring in grated chocolate at the end created a smooth, firm top layer, which made a suitably elegant finish for this rich yet refined cookie.

INGREDIENTS

subheading: Crust:

2 ½ cups (12 ½ ounces) all-purpose flour

½ cup (3 ½ ounces) granulated sugar

¾ teaspoon salt

16 tablespoons unsalted butter, melted

subheading: Filling:

1 (14-ounce) can sweetened condensed milk

1 cup packed (7 ounces) brown sugar

½ cup heavy cream

½ cup corn syrup

8 tablespoons unsalted butter

½ teaspoon salt

subheading: Chocolate:

8 ounces bittersweet chocolate (6 ounces chopped fine, 2 ounces grated)

note: BEFORE YOU BEGIN

For a caramel filling with the right texture, monitor the temperature with an instant-read thermometer. We prefer Ghirardelli 60% Cacao Bittersweet Chocolate Premium Baking Bar for this recipe. Grating a portion of the chocolate is important for getting the chocolate to set properly; the small holes on a box grater work well for this task. Stir often while melting the chocolate and don’t overheat it. For a caramel filling with the right texture, monitor the temperature with an instant-read thermometer. We prefer Ghirardelli 60% Cacao Bittersweet Chocolate Premium Baking Bar for this recipe. Grating a portion of the chocolate is important for getting the chocolate to set properly; the small holes on a box grater work well for this task. Stir often while melting the chocolate and don’t overheat it.

Directions at americastestkitchen.com

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