This sweet roll dough relies on enrichment rather than extended fermentation for tenderness. Sour cream introduces both fat and acidity; the fat softens the crumb while the mild acidity gently strengthens gluten bonds. The result is a dough that stretches thinly around the lemon-poppy seed filling without tearing. Warm cream poured all over the proofed rolls just before baking seeps into the outer layers, creating steam in the oven and protecting the exposed dough from drying, resulting in plush centers and softly caramelized edges.
4 cups (500 grams) all-purpose flour1/3 cup (67 grams) granulated sugar1 tablespoon (9 grams) poppy seeds2¼ teaspoons (7 grams) instant yeast2 teaspoons (4 grams) lemon zest1 teaspoon kosher salt¾ cup (180 grams) hot whole milk (120°F/49°C to 130°F/54°C)½ cup (120 grams) sour cream, room temperature1 large egg (50 grams), lightly beaten and room temperature½ cup (113 grams) unsalted butter, cubed and softened
¾ cup (150 grams) granulated sugar½ cup plus 2 tablespoons (141 grams) unsalted butter, room temperature1½ tablespoons (9 grams) lemon zest¼ teaspoon kosher salt1 tablespoon (9 grams) poppy seeds½ cup (120 grams) warm heavy whipping cream (105°F/41°C to 110°F/43°C)
1½ cups (180 grams) confectioners’ sugar½ cup (112 grams) mascarpone cheese*, room temperature¼ cup (60 grams) heavy whipping cream, room temperature¼ teaspoon kosher salt
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