Why It Works
- Powdered sugar and tapioca starch reduce the need for flour, weakening the dough for a deliciously delicate cookie.
- Tapioca breaks down at relatively low temperatures, so the cookies taste buttery and rich, not starchy.
- Preparing the dough in a food processor helps release essential oil from the lemon zest, boosting the flavor of the dough.
As the daughter of an extroverted Southern lady, I attended more than my fair share of church socials, bridal luncheons, housewarmings, and baby showers, each a blur of pastel crepe paper and plastic party plates. While the specifics of any given menu were generally potluck, I could always count on two things: a glittering bowl of rainbow sherbet punch, and a tray of lemon meltaways.
It was the buttery shortbread that made these dress-up events worth attending, my chance to mainline powdered sugar for an afternoon while Mom looked the other way. They tasted like a glass of lemonade magicked into a snackable form, magic being the operative term, because lemon meltaways taste preternaturally light.
Sugar Showers: The Characteristics of a Lemon Meltaway
Instead of having a crisp or crunchy texture, meltaways disintegrate in a shower of sandy crumbs that evaporate off your tongue like cotton candy, leaving nothing but a lemony aroma in their wake. Well, that and enough powdered sugar down the front of your shirt to count as a Tony Montana cosplay.
With lemon meltaways, powdered sugar isn't just a finishing touch but an integral part of the dough. Along with a generous helping of cornstarch, it reduces the overall need for flour, weakening the cookie's structure to create a uniquely fragile crumb. Like any sort of dark art, the magic of cornstarch comes at a price.
Adapting the Classic Recipe
As a kid, I never seemed to mind (maybe because of all that rainbow sherbet punch), but I just can't handle that level of starchiness anymore. The problem is that cornstarch holds up well (that is, it won't break down or change form) in relatively low-moisture, low-heat applications—like, say, lemon meltaways. The eggless dough doesn't contain any liquids at all, and in the oven, its internal temperature remains well within a range that cornstarch can tolerate. That means it's still functionally a raw starch by the time you bite into a meltaway, allowing the crumbs to soak up moisture like a sponge and leaving a chalky residue on your tongue. Yum.
Having recently discovered the joy of powdered sugar made from tapioca starch, which breaks down at much lower temperatures, I immediately wondered if a simple swap could solve my meltaway dilemma.
And freshness is where it's at for these cookies, so, to put that feeling front and center, I decided to prepare the dough in a food processor, which can grind bits of finely zested lemon into even tinier pieces, coaxing out more essential oil for an even stronger flavor.
(As a lengthy aside: Because the dry mix is so powdery and fine, merely turning on the food processor will send up a fog of powdered sugar, flour, and starch that will creep from every crevice. To avoid coating my kitchen in a layer of dust, I loosely covered the bowl with a sheet of plastic wrap before closing the lid—something I do with most recipes simply to cut down on clean-up.)
After grinding until the zest disappeared, I tossed in cubes of cold butter and pulsed to form a stiff dough. Since meltaways contain more butter than every other ingredient combined, I knew the dough would benefit from a long chill. Given that I wanted to keep the meltaways thin, I opted to treat them like a traditional icebox cookie, rolled into a log and refrigerated until firm.
From there, it was a simple matter of slice 'n' bake, and I pulled the cookies from the oven as soon as I noticed their edges beginning to brown. While the cookies were still a little warm, I finished them off with a generous dusting of powdered sugar on both sides—bottom first, so the tops stayed pretty.
Even with a cornstarch-y dough, that first batch proved far more delicious than the meltaways I remembered, largely thanks to their small size.
Cornstarch vs. Tapioca Starch
With that solid-but-starchy foundation established, I rolled up my sleeves to begin adapting the recipe to tapioca. What I didn't anticipate was that my very first experiment would prove to be the best of them all. Made with tapioca starch, the shortbread baked up visually identical to the original, with the same buttery richness and lemony flavor. But, freed from that damnably starchy aftertaste, their delicate texture truly seemed to melt away on my tongue.
It's rare to nail anything on the first try, so I continued adjusting the levels of starch and powdered sugar through another dozen trials. But in the end, I found that any increase in sugar or decrease in starch caused the cookies to spread and brown. I even played around with other starches and found that arrowroot works just as well. Both are easy to find in stores or online, from brands like Bob's Red Mill. (You can also find paper sacks of tapioca starch in your favorite Asian market, often for a fraction of the price.)
I'll always be partial to tapioca starch. Not only did it redeem powdered sugar in my eyes, it was the first starch to help me reclaim a sweet and simple childhood treat that I thought I'd given up for good. Now, if only I could figure out how to re-create that rainbow sherbet punch...
For the Dough:
3 ounces low-protein all-purpose flour (2/3 cup; 85g), such as Gold Medal
1 1/8 ounces tapioca starch (1/4 cup; 30g)
1 ounce powdered sugar (shy 1/4 cup; 30g), preferably tapioca-based (most organic brands are tapioca-based)
1/8 ounce grated zest from 1 lemon (1 tablespoon; 4g)
Pinch of kosher salt
4 ounces cold unsalted butter (1 stick; 115g), cut into 1/4-inch dice
1/4 teaspoon lemon oil or extract, optional
2 ounces powdered sugar (1/2 cup; 55g)
To Make the Dough: In the bowl of a food processor, combine flour, tapioca starch, powdered sugar, lemon zest, and salt. Cover with a sheet of plastic wrap to contain the fine dust, close lid, and process until zest disappears. Add butter and lemon oil, if using, and pulse to form a smooth dough. With flour-dusted hands, roll dough into a 10-inch log about 1 inch thick. Wrap tightly in plastic and refrigerate until cold, about 4 hours or up to 1 week.
Baking the Cookies: Adjust oven rack to middle position and preheat to 350°F (180°C). Slice chilled dough into 1/4-inch rounds and arrange on parchment-lined half sheet pan, leaving about an inch between each cookie. Bake until firm and just barely golden around the edges, about 12 minutes.
To Finish: When they are cool enough to handle, but still slightly warm, gently flip the cookies upside down. Sift about 1 ounce of powdered sugar on top, then flip right side up and sift another 1 ounce on top. Once cool, enjoy with hot tea or as a garnish for ice cream and sorbet. Store leftovers at room temperature in an airtight container for up to 2 weeks.
This dough will not tolerate any more than a few drops of liquid, so take care when experimenting with extracts, juice, or liquors.
|Nutrition Facts (per serving)|
|Amount per serving|
|% Daily Value*|
|Total Fat 2g||3%|
|Saturated Fat 1g||7%|
|Total Carbohydrate 4g||2%|
|Dietary Fiber 0g||0%|
|Total Sugars 2g|
|Vitamin C 0mg||0%|
|*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.|