1/2cup powdered sugar (plus more for pressing cookies)
1/2cup (1 stick) chilled butter, cut into 1/2-inch cubes
2tablespoons sliced fresh basil leaves
1teaspoon finely grated lemon rind
1tablespoon fresh lemon juice
1/2teaspoon finely grated lime rind
Preheat oven to 375F.
Combine flour, sugar, butter, basil, lemon and lime rind, lemon juice and salt in the bowl of a food processor. pulse unti combimed. Add 1 or 2 tablespoons water (1 at a time) and pulse until large moist clumps are formed.
Using a tablespoon, measure out dough and roll into balls. Place on a baking sheet 2 inches apart. Dampen the bottom of a glass, dip in powdered sugar and press cookies into 2-inch rounds.
Bake 15 to 20 minutes. Transfer to a wire rack to let cook completely.