Key Lime Cake

First Prep Key Lime Custard:

1. In a medium saucepan, whisk together egg yolks and cornstarch. Whisk in sweetened condensed milk and lime zest and juice until smooth. Bring to a boil over medium heat, whisking constantly. Cook, whisking constantly, until thickened and smooth, 1 to 2 minutes. Pour into a heatproof bowl, and cover with plastic wrap, pressing wrap directly onto surface of custard to prevent a skin from forming. Refrigerate until completely cooled. Makes about 1 1/2 cups

Cake:

1. Preheat oven to 170°C.
2. In the bowl of a stand mixer fitted with the paddle attachment, beat butter and sugar at medium speed until fluffy, 3 to 4 minutes, stopping to scrape sides of bowl. Add eggs, one at a time, beating well after each addition.
3. In a medium bowl, whisk together flour, graham cracker crumbs, baking powder, and salt. In a small bowl, whisk together milk and vanilla. With mixer on low speed, gradually add flour mixture to butter mixture alternately with milk mixture, beginning and ending with flour mixture, beating just until combined after each addition.
4. Spray a Nordic Ware 6-Cup Charlotte Cake Pan with baking spray with flour. Using a pastry brush, spread any excess spray in pan, blotting brush with a paper towel as needed. Spread batter into prepared pan. Tap pan on a kitchen towel-lined counter several times to settle batter and release any air bubbles.
5. Bake until golden and a wooden pick inserted in center comes out clean, 35 to 40 minutes. Let cool in pan for 10 minutes. Invert cake onto a wire rack, and let cool completely.

Swiss Meringue:

1. In the heatproof bowl of a stand mixer, whisk together sugar and egg whites by hand. Place bowl over a saucepan of simmering water. Cook, whisking frequently, until sugar completely dissolves and an instant-read thermometer registers 120°F (49°C) to 130°F (54°C).
2. Carefully return bowl to stand mixer. Using the whisk attachment, beat at high speed until stiff peaks form and bowl is cool to the touch, 2 to 3 minutes. Use immediately. Makes about 1 cup

Serving:

1. Transfer cake to a serving plate. Fill with Key Lime Custard, spreading with an offset spatula.
2. Place Swiss Meringue in a large pastry bag fitted with a ½-inch open star piping tip (Ateco #825). Pipe meringue as desired. Using a handheld kitchen torch, carefully brown meringue as desired. Serve immediately.