At a Glance
Zwiebelbrot is a savory sourdough loaf combining caramelized onions, a chewy crumb and a crisp crust. Long fermentation develops sweetness and improves digestibility; onion addition contributes moisture and flavor while requiring small adjustments to hydration and fermentation management[1][2].
Not suitable if:
- • You are avoiding onion flavor → see other special breads
- • You don't have an active starter → create a starter first
🛒 Recommended Products
We recommend the following tools for this recipe:
Digital Kitchen Scale
Essential for accurate measurements of flour, water and onions
Large Mixing Bowl
Easy mixing and bulk fermentation space
Dough Scraper
Helps fold and handle sticky dough
Dutch Oven
Traps steam for a crisp, glossy crust
Bread Lame
For controlled scoring of the loaf
As an Amazon Associate we earn from qualifying purchases. Links are affiliate links.
Ingredients
Weigh all ingredients on a kitchen scale. For savory breads, ingredient weights and hydration control are important for crumb and oven spring[1].
| Ingredient | Amount | % | Note |
|---|---|---|---|
| Bread flour | 420g | 84% | strong flour for structure |
| Whole wheat flour | 80g | 16% | adds flavor and color |
| Water | 330g | 66% | lukewarm (20-24°C); adjust slightly if onions are wetter |
| Active sourdough starter | 120g | 24% | fed and active (bubbly, 4-8 hours after feed depending on temp) |
| Salt | 10g | 2% | adds taste and strengthens gluten |
| Caramelized onions | 220g (approx. 2 medium onions before cooking) | 44% | cook down to concentrated, drain excess oil or butter |
| Olive oil | 10g | 2% | for cooking onions; excess removed before mixing |
Schedule
Weekend Version
Gentle daytime schedule with room-temp bulk
Weekday Version
Evening mix, morning bake
💡 Tips
- If dough ferments faster than expected, move to fridge to slow activity[1].
- Caramelized onions add moisture—if dough is noticeably loose, rest 15-30 min before shaping to let flour hydrate fully[2].
Step by Step
Prepare caramelized onions
Slice onions thinly. Cook in a stainless or non-reactive pan with a little olive oil (or butter) over medium-low heat until deeply golden and reduced (~30–40 min). Drain off any excess fat and cool to room temperature. Well-caramelized, concentrated onions add flavor without making the dough soggy[2].
⏱ 30-40 minutes
Autolyse and mix
Combine flours and water in a large mixing bowl. Rest 30 min (autolyse). Add active starter and salt, mix with a dough scraper or dough whisk until incorporated. Dough should feel tacky but cohesive.
⏱ 10 minutes + 30 min autolyse
Incorporate onions and bulk ferment
Add cooled onions and fold them into the dough using wet hands or a dough scraper. Perform 3-4 sets of stretch-and-folds at 30–45 min intervals during first 2–3 hours to build structure. Cover the dough between folds[1].
⏱ 2-4 hours (depending on temperature)
Pre-shape and bench rest
Turn dough onto a lightly floured surface. Pre-shape into a round/oblong and rest 20–30 minutes under a bowl or towel to relax gluten before final shaping.
⏱ 20-30 minutes
Shape and final proof
Shape into desired loaf (batard or boule). Place seam-side up in a floured banneton. Final proof at room temp 1.5–2 hours or refrigerate 10–14 hours for better flavor and handling[1].
⏱ 1.5–14 hours (depending on chosen method)
Bake
Preheat oven to 250°C/480°F with a Dutch oven inside for 30–45 min. Turn loaf onto parchment paper, score with a bread lame, and place into preheated Dutch oven. Bake covered 15–20 min, then remove lid and reduce to 200°C/400°F for 25–35 min until crust is deep brown. Internal temperature should reach 96–98°C (205–208°F), check with an instant-read thermometer[1][2].
⏱ 45–60 minutes
Cool
Remove from oven using oven mitts and cool on a rack for at least 2 hours before slicing. Cooling completes starch gelatinization and prevents gummy crumb[1].
⏱ 2+ hours
Tips & Variations
Variations
Cheese and onion
Add 100g grated aged cheddar folded in with onions
→ Savory richness and melty pockets
Herb version
Add 1 tbsp chopped fresh thyme or rosemary with onions
→ Fresh aromatic note
Caramelized shallots
Replace onions with shallots for a sweeter, more delicate flavor
→ More subtle sweetness
Pro Tips
- 💡 Control onion moisture: excess will weaken gluten—pat onions dry after cooking and drain well[2].
- 💡 Use a dough scraper to help fold onions in without tearing dough.
- 💡 Allow a cold final proof for cleaner scoring and improved oven spring[1].
- 💡 Slice the loaf the next day with a serrated bread knife to retain crumb texture.
Common Issues
Common problems with onion sourdough and how to fix them:
Storage
Room temperature in bread bag/box
4-6 days
Keep cut side down to reduce crust drying
Kitchen towel
3-4 days
Use breathable linen to avoid trapping moisture
Freezing
3 months
Slice before freezing; toast or warm slices from frozen
⚠️ Avoid refrigeration—starch retrogradation accelerates staling in the fridge[1].