<   &nbspbioderma matricium; Make the crusts: Beat butter and sugar with a mixer on low speed until just combined. Add flour and 1/8 teaspoon salt; beat on low speed until dough comes together, 3 to 5 minutes. Press dough into a disk the beauty, and wrap in plastic. Refrigerate for 20 minutes.
    Preheat oven to 325 degrees F . Roll out dough to a scant 1/4-inch thickness on a lightly floured surface. Cut out thirty-two 3-inch rounds or twenty-five 3 1/2-inch rounds, and fit each into a 2 1/2- or 3-inch tart pan. Trim excess dough flush with edges of pans using a knife. Refrigerate until firm, at least 1 hour or overnight. Bake, pressing down dough if puffing, until pale gol　, about 25 minutes. Let cool completely.
    Make the filling: Heat milk and 1/2 cup cream in a medium saucepan over medium-high heat until almost boiling. Whisk together yolks, sugar, cornstarch, flour, and a pinch of salt. Slowly pour some of the warm milk mixture into yolk mixture, and whisk to combine. Pour yolk mixture into saucepan with remaining milk mixture. Bring to a boil, whisking constantly, and cook for 1 minute, continuing to whisk.
    Strain mixture through a fine sieve youfind online, and whisk in vanilla. Place plastic wrap directly on surface of pastry cream, and refrigerate at least 1 hour or overnight. When ready to use, whip remaining 1/2 cup heavy cream until soft peaks form. Fold into pastry cream.
    Assemble the tarts: Fill each tart shell halfway with pastry cream. Top with berries; gently brush with jam