Crust:2 cups (224 grams) chocolate sandwich cookie crumbs (see Note)3 tablespoons (36 grams) granulated sugar¼ teaspoon kosher salt¼ cup (57 grams) unsalted butter, melted and cooled1 large egg yolk (19 grams)Filling:¾ cup (225 grams) Satsuma Marmalade (recipe follows)¾ cup (232 grams) sweetened condensed milk2 tablespoons (6 grams) satsuma zest3 tablespoons (45 grams) fresh satsuma juice3 large egg yolks (56 grams), room temperature2 teaspoons (6 grams) vanilla extract⅛ teaspoon kosher saltSweetened whipped cream, to serveGarnish: Candied Satsuma Peels (recipe follows)
Preheat oven to 350°F (180°C). Spray a 13½x4¼-inch fluted removable-bottom tart pan with baking spray with flour.
For crust: In a medium bowl, stir together cookie crumbs, sugar, and salt.
In a small bowl, whisk together melted butter and egg yolk. Stir butter mixture into cookie crumb mixture until well combined. Press mixture into bottom and up sides of prepared pan.
Bake until fragrant, 15 to 20 minutes. Let cool for 30 minutes. Leave oven on.
For filling: Using a small offset spatula, spread Satsuma Marmalade in bottom of cooled prepared crust; freeze until cold, 10 to 15 minutes.
In a large bowl, whisk together condensed milk, satsuma zest and juice, egg yolks, vanilla, and salt until well combined. Spread onto marmalade in prepared crust. Using a wooden pick, pop any air bubbles on surface.
Bake until fragrant and edges of crust look dry, edges of filling are set, and center jiggles slightly, 20 to 25 minutes. Let cool completely in pan on a wire rack. Loosely cover and refrigerate until cold, at least 4 hours, or up to overnight.
Just before serving, remove from pan, and top with whipped cream. Garnish with Candied Satsuma Peels, if desired.
Note: Separate 25 cream-filled chocolate sandwich cookies into 50 individual cookies; scrape off and discard cream filling. Crush the individual cookies into crumbs.