INGREDIENTS
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17.62 oz. (4 cups) unbleached all-purpose flour
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1⁄3 cup sugar, plus more for coating the doughnuts
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1 Tbs. plus 1-1?2 tsp. instant yeast
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3⁄4 tsp. fine sea salt or kosher salt
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1 cup room temperature milk (70°F to 78°F)
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2.5 oz. (5 Tbs.) unsalted butter, softened
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2 large eggs
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2 large egg yolks
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1 tsp. grated lemon zest
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2 tsp. pure vanilla extract
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Vegetable oil, for frying
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6 Tbs. raspberry jam