Sugared Lemon Sandwich Cookies

• 1
  cup
  confectioners sugar
• 1
  tablespoon
  grated lemon zest
• 1
  tablespoon
  fresh lemon juice
• 2
  tablespoons
  light corn syrup
• 1/2 stick
  unsalted butter, softened 

Preheat oven to 350°F with rack in middle. Line 2 large baking sheets with parchment paper.  Whisk together flour, cornstarch, and salt.

Beat
together butter and confectioners sugar with an electric mixer until
pale and fluffy, then beat in zest and vanilla. At low speed, mix in
flour mixture just until a soft dough forms.

Put
sanding sugars in different bowls. Roll a scant tsp of dough into a
ball and drop into sugar, turning to coat. Reshape if necessary and
transfer to a baking sheet. Repeat, spacing balls 3/4 inch apart, until baking sheet is filled.

Bake
until tops are slightly cracked but still pale (bottoms will be pale
golden), 12 to 15 minutes. Transfer cookies on parchment to a rack to
cool completely.

Form and bake more cookies on second baking sheet.

To make the filling and assemble the cookies, beat
together all filling ingredients in a large bowl with an electric mixer
at medium speed until combined well. Transfer to sealable bag and snip
off a corner.

Turn over half of cookies and pipe about 1/2 tsp filling on flat side of each. Sandwich with remaining cookies, pressing gently.

My Usual Notes:

• I cut this recipe in half.  I weighed the flour and reduced the weight by half (1-1/3 c. flour = 6 oz., so half would be 3 oz. give or take 1/8 oz.
• I used demerara sugar to roll the dough balls in.  The sugar adheres easily to the dough.
• I baked these for 10 minutes instead of the recommended 12-15 minutes.  At about 8 minutes, I noticed a little crusty rim forming around each cookie, so I turned the oven down 10 degrees for the remaining 2 minutes.  Because I've had a couple of recipes "spread" I wasn't taking any chances!
• When cookies are right from the oven, carefully insert a very thin spatula under each and place on a rack to cool.
• I carefully brushed off the crusty rim of each cookie before piping the filling.
• If you wanted to make these more festive, you could use a colored sanding sugar, or color the filling.
• Make sure cookies are completely cool before filling and then refrigerate after filling.
• A half recipe made 10 cookie sandwiches about the size of a nice walnut.  If the original recipe states that 50 are possible, then I'd recommend making the dough balls about 1/2 tsp. even though it states "a scant teaspoon full."  In that case, I'd definitely watch the cooking time.
• Although these are tasty cold, I'd recommend letting them sit out about 10 minutes before serving.

Don't forget to visit the rest of our cookie crew testing Gourmet's favorite cookies:  Andrea of Andrea's Recipes, Claire of The Barefoot Kitchen, Sandy of At the Baker's Bench, Courtney of Coco Cooks, Judy of No Fear Entertaining, and Jerry of Cooking by the Seat of My Pants.  I know they've got something delicious just waiting for you!