01 -
Preheat oven to 95°C (200°F). In a large bowl or stand mixer, mix together 530 g flour, instant dry yeast, poppy seeds, and salt.
02 -
In a separate bowl, place buttermilk, granulated sugar, and unsalted butter cut into cubes. Microwave for 1 minute and stir until mostly melted; ensure mixture is warm, not hot.
03 -
Slowly pour the warm buttermilk mixture into the dry ingredients. Mix on medium speed with a dough hook or by hand using a dough whisk or wooden spoon until a sticky dough forms.
04 -
Add eggs one at a time, mixing on medium-low until fully combined and dough is slightly elastic. Mix in lemon zest until incorporated.
05 -
Add additional flour, 1 tablespoon at a time, until dough begins to leave sides of the bowl and feels tacky but not sticky. No residue should come off on your finger.
06 -
Cover bowl with plastic wrap or a towel and let dough rest 10–20 minutes to relax gluten for easier rolling.
07 -
In a medium bowl, combine granulated sugar, brown sugar, and lemon zest. Massage zest into sugars to release oils. Add softened unsalted butter and blend until smooth.
08 -
On a lightly floured surface, roll rested dough into a 30 x 46 cm (12 x 18 in) rectangle, about 0.5 cm thick.
09 -
Spread the filling evenly over the dough, leaving a 1.25 cm (1/2 in) strip on a long edge uncovered. Roll dough tightly towards the uncovered edge and pinch to seal.
10 -
Use dental floss to cut the rolled dough into 12 equal segments. Arrange rolls in a greased or parchment-lined 23 x 33 cm (9 x 13 in) pan.
11 -
Turn off oven and cover pan tightly with foil. Place in warm oven for 30 minutes to rise until puffy.
12 -
Remove pan and foil. Preheat oven to 175°C (350°F). Bake for 28–32 minutes or until rolls are golden brown.
13 -
Whisk together powdered sugar, lemon juice, and melted butter until smooth and pourable.
14 -
Allow rolls to cool 10–20 minutes. Spoon icing over warm rolls and garnish with fresh lemon zest.