8 tablespoons (1 stick) cool unsalted butter, cut into pieces
1/4 cup plus 2 tablespoons sugar
1 cup all-purpose flour
1/4 cup cornstarch
1/4 teaspoon salt
2 tablespoons dried or fresh lavender flowers
Heat the oven to 350 degrees F.
Cream the butter until soft in a mixer fitted with a paddle attachment. Add 1/4 cup sugar and mix until incorporated. Stir together the flour, cornstarch, and salt in a medium bowl. Add the dry ingredients to the butter mixture and mix at low speed just until the ingredients are almost incorporated, then add the lavender, and mix until the dough starts to come together. Flour a work surface, turn the dough onto it, and knead it 5 to 10 times, to bring the dough together and smooth it out.