KUBANEH (YEMENITE JEWISH BREAD)

Steps:

• Sourdough Prep
• If you're doing the sourdough version, make the sweet stiff starter the night before you plan to bake. After mixing the ingredients, knead the starter dough a bit on your counter to fully incorporate the ingredients, then place the blob in a jar, press it down with your knuckles and cover loosely. The starter should double (or more) in 8-12 hours, and you can proceed with the rest of the instructions.
• Mixing
• Pull 57g/half stick of butter from the refrigerator, unwrap it, and place it on a small plate to soften. Fold the wrapper in half and save it to grease your springform pan and countertop. Reminder: The butter doesn't go into the dough during mixing.
• Whisk the dry ingredients in a large bowl: flour, sugar, (yeast), and salt.
• Add the water, whole egg, egg white, (and sourdough starter broken into pieces). Mix thoroughly until the dough is smooth.
• Pour 1 tablespoon of oil on top of the dough, cover, and let the dough rise until it has more than doubled. In a warm summer kitchen, this took 1 hour for the yeast version and 4.5 hours for the sourdough version.
• Shaping and Final Proof
• Smudge a bit of the softened butter onto your saved butter wrapper and grease a 9-inch springform pan. Use this wrapper to lightly grease your countertop too.
• Scrape the dough out of the bowl and de-gas it by pressing your palms into it.
• Divide the dough in 12-18 pieces. See the photo galleries for different outcomes with fewer large pieces (yeast) versus more smaller pieces (sourdough).
• Working one piece at a time, spread the dough thin with butter-coated fingertips. Don't worry if you tear the dough a bit.
• Layer more butter on the thin dough, then sprinkle it with nigella seeds. (Have a paper towel nearby to occasionally de-seed your buttery fingers as the seeds will shred the next dough ball.)
• Fold the dough in thirds, and then roll it from a short side.
• Place the roll in your pan, working from the center outward. It's okay if the rolls topple over a bit. You can adjust them later, and a little chaos adds to the appeal.
• When all the rolls are done, cover your pan and let the dough rise until it has more than doubled. This was 1 hour for the yeast version and 2.5 hours for the sourdough version. See the photo gallery for expansion.
• Baking
• Preheat your oven to 350F.
• Beat the egg yolk with a tablespoon of water and brush the top of the dough. Sprinkle with nigella seeds and bake for 30 minutes uncovered.
• Let the dough cool on a rack for about 20 minutes before you remove the outer ring of the pan. Serve on the base.