"This custardy cake requires no mixer and comes together in minutes. Seriously, it’s easy!..."
INGREDIENTS
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4 Tbsp. melted unsalted butter, cooled, plus more room-temperature for pan
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1 cup all-purpose flour, plus more for pan
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¾ tsp. baking powder
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½ tsp. kosher salt
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2 large eggs
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1 large egg yolk
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1½ cups sugar, plus more for sprinkling
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¼ cup sour cream
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2 Tbsp. dark rum
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2 tsp. finely grated lemon zest
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13 oz. rhubarb stalks, halved lengthwise if thick
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A 9"-diameter springform pan