METHOD
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dough
Into the bowl of a stand mixer (or use a large bowl and a hand mixer with dough attachments), add the flour and sugar. Use a wooden spoon to make a well in the center. Pour the lukewarm milk into the well. Add the dry yeast and cover the wet ingredients with some of the flour. Add the eggs, egg yolk, grated lemon zest, rum (optional), and salt. Start kneading. Knead on medium speed for 6–8 minutes, or until the dough is elastic, smooth, and pulls away from the sides of the bowl. Add the butter and knead for another 3–4 minutes, until the butter is fully incorporated and the dough once again pulls away from the bowl.
TipThe temperature of the water and milk should be between 30–35°C / 86 - 95 °F.If you are using all-purpose flour, use 2 tbsp milk less. -
first proofing
Cover the bowl with the dough with plastic wrap and let it rise at room temperature (22–25 °C / 71 - 77 °F.) until it has visibly risen, about 1 to 1½ hours.
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shape
Generously flour the work surface. Divide the dough into 12 pieces, each weighing about 80–85 g (3 ounces). Set them aside for 5 minutes. Roll each piece of dough into a circle. Place a generous spoonful of jam in the center. Fold the edges of the dough over the filling and pinch them together at the top to form a ball. Make sure the dough fully covers the filling and that there are no openings through which the filling could escape during baking. Grease a baking pan (about 22 cm x 30 cm / 8.5-inch x 12-inch ) well with butter on the bottom and sides.
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second proofing
Place the buns into the greased baking pan. Brush the sides where the buns will touch each other with melted butter (but not the tops). Cover with a kitchen towel and let them rise at room temperature for 1 hour to 1 hour 30 minutes, until visibly risen. Position the oven rack in the center of the oven and preheat the oven to 180 °C (350 °F).
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bake
Place the baking pan with the risen buns into the preheated oven and bake for 40 minutes at 180 °C (350 °F). After twenty minutes of baking, cover the buns with parchment paper or aluminum foil so they don’t brown too much. When they are done, remove them from the oven and immediately cover them with a kitchen towel for 10–15 minutes to soften. Then remove them from the pan and let them cool to room temperature. Dust with powdered sugar and serve.