Preheat oven to 350℉. Gather all your ingredients so that you have everything close at hand on the counter or table.
Prepare the Tart Shells
In medium bowl, mix together the all-purpose flour, granulated sugar, and baking soda.
Using a pastry fork, cut in butter until crumbly.
Create a hole in the center. Add in egg and mayonnaise. Mix together until well blended and the consistency of cookie dough. Lightly knead 4-5 times.
Roll into 24 walnut-sized balls. Place each ball into wells of a lightly greased mini-muffin pan. Using your fingers or a wooden tart press, form dough along bottom and up the sides of each well.
Bake in preheated oven for 10 minutes or until edges are golden. Remove crusts to a wire rack to cool.
Assemble the Tarts
Fill each tart shell with lemon pie filling (or homemade Lemon Curd) and top each with a fresh raspberry or blueberry. May also garnish with a dollop of whipping cream.
Chill until ready to serve. Makes 24 tarts.
Notes
*Unless otherwise indicated, all butter used on this recipe site is salted.