INGREDIENTS
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1 1/4 cups (160 grams) all-purpose flour
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1/2 teaspoon baking soda
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1/2 teaspoon cream of tartar
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1/8 teaspoon salt
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1/2 cup (120 grams) unsalted butter, room temperature
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1/2 cup (100 grams) granulated sugar
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1/2 vanilla pod, split and scraped
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1 1/2 teaspoons freshly grated lemon zest
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1 egg
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Sprinkles, for the topping