Key Lime Cookies - cooking recipe

Ingredients

Cookie dough
1 3/4 cups all-purpose flour
1/2 teaspoon baking powder
1/4 teaspoon baking soda
3/4 cup butter, softened
1/2 cup icing sugar
1 egg yolk
1 1/2 teaspoons grated key lime rind
4 teaspoons key lime juice
Sugar Coating
1/4 cup granulated sugar
1/2 teaspoon grated key lime zest (scant 1/2 tsp (2ml)

Preparation

Sugar Coating: In small bowl of food processor, whirl sugar and lime rind until sugar is fine. Transfer to bowl; cover and let stand for at least 2 hours or overnight. (If sugar clumps, break up into powder.).
Whisk together flour, baking powder and baking soda; set aside.
Beat butter and icing sugar until light and fluffy; beat in yolk, lime rind and juice. Gradually stir in flour mixture.
Transfer dough to pastry bag fitted with 1/2-inch/ 1 cm star tip (or plastic bag with corner cut out). Pipe out 1-1/2-inch/4 cm long cookies onto parchment paper-lined baking sheet.
Bake in 300\u00b0F/150\u00b0C oven until edges and ridges are just starting to turn golden, 25 to 30 minutes.
Important -
Roll in lime sugar while still warm; let cool on rack.
Makes about 3 dozen cookies.