Prep: Cover the bowl with plastic wrap and let the yeast bloom until foamy and fragrant, about 15 minutes. Transfer the raisins to a separate bowl and cover them with warm water.
7 grams yeast, 50 grams granulated sugar, 226 grams milk, 120 grams raisins
Make the dough: Whisk the egg and dissolve the sourdough discard into the yeast mixture. Stir in the flour, spices, and salt, and mix until a shaggy dough forms.
1 egg, 113 grams sourdough starter, 480 grams bread flour, 1 teaspoon cinnamon, ½ teaspoon ground ginger, ⅛ teaspoon grated nutmeg, 1 whole clove, 9 grams salt
Knead the butter into the dough. Your dough will be greasy at first and gradually feel smoother as the butter is absorbed.
56 grams butter
Cover the bowl with plastic wrap and let the dough rest for 10 minutes. This will make the dough less sticky and much easier to work with.
Strengthen the dough: Turn the dough out onto a clean surface. Dust the surface with a little flour if your dough is too sticky to knead.
Using the heel of your hand, push the dough away from you, then fold it back over itself. Give the dough a quarter turn and repeat. Knead the dough until smooth.
Drain the raisins and blot them with paper towels to make sure most of the moisture is removed. You don't want to add more water to your dough or it will be too sticky and difficult to handle.
Return the dough to the bowl and fold the raisins and chopped candied citrus into the dough until evenly distributed. Kneading the dough first helps keep the raisins and candied citrus intact, preventing them from getting smashed.
60 grams candied orange peel
Bulk fermentation: Gather the dough into a tight ball and transfer it to a clean, lightly oiled bowl. Cover the bowl with plastic wrap and let the dough rise untouched until doubled in volume, about 45 minutes to 1 hour.
Shape the dough: Divide the dough into 12 portions. Working with one piece at a time, flatten the dough into a rectangle. Fold the corners toward the center, and pinch them together to seal. Turn the dough over and drag it on the work surface to round it into a tight ball, and try your best to seal the seam on the bottom. Repeat with the remaining dough portions.
Final proof: Arrange the rolls in a 9 by 13-inch baking pan lined with parchment paper. Cover the pan with plastic wrap and let the dough rise untouched until puffy and almost fills the pan.
Add the crosses: Make a paste out of the powdered sugar, all-purpose flour, and water.
40 grams all-purpose flour, 7 grams powdered sugar, 49 grams water
Transfer the topping to a piping bag. Pipe a straight line across the center of each row of buns, from one side of the pan to the other. Then pipe vertical lines down each column, intersecting the horizontal lines to form crosses.
Bake: Bake the buns at 350°F for 45 to 50 minutes or until golden brown and the temperature of the buns registers at 190°F when probed with an instant-read thermometer.
While the buns bake, heat water and sugar over medium heat until completely dissolved. Brush the warm buns with simple syrup.
50 grams granulated sugar, 56 grams water