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Export 11 ingredients for grocery delivery
Preheat oven at 350ºF / 180ºC.
Spray or butter a 10x4-inch (27x9cm) loaf cake pan and line with a strip or parchment paper.
In a large bowl beat sugar, yogurt, sour cream, oil, eggs, half the lemon and lime juices, zest, and vanilla for 1-2 minutes.
Add dry, sifted ingredients (flour, baking powder, and salt) in 2 parts and beat just to incorporate well. Don't overbeat or the cake will be tough.
Pour batter into the prepared pan and bake for 45-50 minutes, until a toothpick inserted comes out clean. The surface will be shiny and possibly cracked, not as dry as regular cakes.
Let cool on a wire rack and unmold carefully.
Beat powdered sugar with remaining citrus juice until no lumps remain. Add juice in batches so you make it as dense or runny as you wish.
Pour over room tº cake and decorate with zest before it hardens.