"This sourdough starter discard cake is an Italian caked called ciambella: intensely lemony, ultra tender, and effortless to put together...."
INGREDIENTS
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177g neutral-flavored oil, such as canola or a very mild olive oil, plus more for greasing
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423g all-purpose flour (Cairnspring Mills Edison All-Purpose Flour)
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7g baking powder (1 ½ teaspoon)
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3g fine sea salt (½ teaspoon)
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Zest of 1 large lemon
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232g granulated sugar (I like to use superfine sugar)
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171g (3 large) eggs, at room temperature
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211g whole milk
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28g limoncello (2 tablespoons; see Note)
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100g ripe sourdough starter (100% hydration) discard (see Note)
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7g vanilla extract (1 ½ teaspoons)
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Powdered sugar, for topping (optional)