PASSION-FRUIT MELTING MOMENTS

Steps:

• Cookies:Preheat oven to 350 degrees. Line two baking sheets with parchment.
• In the bowl of an electric mixer fitted with the paddle attachment, cream together butter, confectioners' sugar, and vanilla on medium-high speed, scraping down sides as necessary, until fluffy, about 2 minutes. Sift together flour and cornstarch, then add to butter mixture along with salt, beating until just combined. Cover with plastic wrap and refrigerate 1 hour.
• Measure 2 teaspoons of dough and form into a ball; transfer to prepared baking sheets. Repeat with remaining dough, spacing about 1 inch apart. Use a fork to make a three-prong indent on tops of balls. Bake until slightly golden around edges, 10 to 12 minutes. Transfer baking sheets to a wire rack and let cool completely.
• Filling:Heat egg yolks, passion fruit, granulated sugar, and salt in a medium saucepan over medium, stirring constantly, until mixture is thick enough to coat the back of a spoon, about 10 minutes. Stir in butter and gelatin and mix until the butter has melted and the gelatin has dissolved. Strain curd into a medium bowl, then place plastic wrap directly onto surface; refrigerate until set, at least 1 hour.
• Spread 1 scant teaspoon curd each on bottoms of half the cookies. Dust remaining cookies with confectioners' sugar; sandwich halves together. Filled cookies are best eaten the day they are made.