1 cup butter unsalted cold cut into pieces (2 sticks)
1 teaspoon vanilla extract pure
Equipment
bowl
frying pan
oven
knife
wire rack
blender
plastic wrap
hand mixer
pizza cutter
Directions
In a mixer fitted with a paddle attachment, or using your fingers, combine the flour and salt in a large bowl.
Add the butter and, using your fingertips, pinch the ingredients together into a sandy, crumbly mixture. In a mixer fitted with a paddle attachment (or using a hand mixer), mix the sour cream and egg yolk until very smooth.
Add the flour mixture and mix until the dough comes together. The dough may feel a little dry. Form into a disk, wrap it in plastic wrap and chill at least 4 hours or overnight. In a bowl, mix the cream cheese, egg, sugar, vanilla and lemon zest. On a work surface thickly dusted with confectioners' sugar, roll out the pastry to a squarish or rectangular shape, 1/8-inch thick. Using the tip of a sharp knife or a pizza cutter, cut into 3 by 3-inch squares.
Place a teaspoon of filling in the center of each square. Lift up one square, gathering the center of the square around the filling into a cup. Hold it in the fingers of one hand. Use the fingers of your other hand to gently push the midpoints of the sides inward, so that the 4 corners become the points of the petals. The cookie will look like a flower that is opening.
Place the cookie in a mini muffin cup. Repeat with the remaining squares and refrigerate 30 minutes.