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1
Prepare the fruit: Using a vegetable peeler and a light touch, remove the zest from half of the lemon. Try to remove the zest in small pieces and leave the pith (the white part) behind. Juice the lemon into a medium bowl and mix in the zest, granulated sugar, and strawberries. Cover the bowl and refrigerate until ready to assemble the tarts.
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2
Preheat the oven to 375u00b0F.
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3
Make the batter: Using a fine-mesh strainer or sifter, sift together the confectioners' sugar and flour into a medium bowl. Use your hands to push the sugar and flour through the strainer to make sifting easier. Whisk in the butter and orange juice.
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4
Use a cookie sheet or invert a rimmed, baking sheet onto the counter, making sure the bottom is clean. Coat with a thin layer of cooking spray. Spoon a generous teaspoon of the batter near the corner of the sheet and use a small offset spatula to spread it thinly into a small, imperfect oval, about 3 1/2- by 2 1/2- inches. Take care to leave about an inch between the ovals because they will spread a bit when they are baked. You should be able to fit about 10 on the sheet at one time.
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5
Bake the tart shells: Have ready a mini muffin tin or clean egg carton. Put the tuiles in the oven and bake until light brown, 8 to 11 minutes. Remove the baking sheet from the oven and while the tuiles are still warm, use an offset spatula to transfer a tuile from the baking sheet to the muffin tin. Using your fingers, press down in the center to create a shell that mimics the shape of each muffin cup. The sides will overlap or be higher than the muffin cup. That's fine. Your goal is to make a mini tart shell to fill with the strawberries. Repeat with the remaining tuiles, working with only one at a time. If the tuiles cool too much on the baking sheet before molding and aren't flexible, return the sheet to the warm oven for a minute to loosen them up before continuing. Let the tart shells cool completely.
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6
Glaze the berries: Strain the liquid from the strawberries and pour it into a small pan. Simmer over medium heat to reduce until it becomes syrupy and reduced by half, about 4 minutes. Allow to cool slightly, then pour it back over the strawberries, and toss to blend.
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7
Serve the tarts: Remove the shells from the muffin tin. Put a small dollop of sour cream in the bottom of each shell and top with some of the strawberries. Assemble and then eat immediately. They become soggy quickly.
