Sourdough Flammkuchen (Tarte Flambée) – Thin, Crispy & Tangy

A crisp sourdough flammkuchen recipe with a light, tangy crust and classic toppings. Fast bake, easy technique, and options for overnight fermentation.

At a Glance

Difficulty
medium
Active Time
20 minutes
Total Time
6–26 hours (depends on cold proof)
Yield
4 small flammkuchen (about 30cm / 12" each) or 2 large

Sourdough flammkuchen is a very thin, crisp flatbread traditionally topped with crème fraîche, thinly sliced onions, and bacon. Using a mature active starter for a short fermentation gives a subtle tang and better extensibility for stretching very thin doughs. This recipe balances quick preparation with options for an overnight cold fermentation for improved flavor and handling [1][2].

✓ Thin, crisp crust with sourdough flavor ✓ Flexible schedule: same-day or overnight cold proof ✓ Quick bake (6–10 minutes at high heat)

Not suitable if:

Ingredients

Weigh all ingredients on a kitchen scale. Small changes in hydration change extensibility dramatically for thin crusts [1].

Ingredient Amount % Note
Bread flour (or strong all-purpose) 500g 100% Higher protein helps a thin, elastic dough
Water 325g 65% Room temperature (about 20–22°C)
Active sourdough starter (100% hydration) 75g 15% Fed and active within 4–8 hours
Salt 10g 2%
Olive oil 15g 3% Adds extensibility and browning

Schedule

Same-Day (Quick)

Mix and bake within a few hours for minimal tang

0:00 Mix dough and autolyse 20 min (20 min)
0:20 Add starter and salt, mix until cohesive (10 min)
0:30-2:30 Bulk ferment at room temp (1.5–2 hrs) with 2 folds (1.5–2 hours)
2:30 Portion and rest 15–30 min (15–30 minutes)
3:00 Stretch, top, and bake (6–10 minutes)

Overnight Cold Proof (Recommended)

Develops flavor and makes dough easier to stretch

Evening Mix dough, short bulk ferment 45–60 min (45–60 minutes)
Evening Divide, lightly oil, place in containers or a [banneton](https://amzn.to/4sNHBYO) and refrigerate (12–18 hours)
Next day 30–60 min before baking Bring dough to room temp (30–60 minutes)
Next day Stretch, top, and bake (6–10 minutes)

💡 Tips

  • If dough resists stretching, rest 10–15 minutes to relax gluten [1].
  • Cold-proofing slows fermentation and gives more predictable handling [2].

Step by Step

1

Autolyse

Combine flour and water in a large mixing bowl. Mix until no dry flour remains and rest 20 minutes. Autolyse improves extensibility so you can stretch the dough paper-thin [1].

✓ Visual check: Dough feels cohesive and smoother after rest
⚠️ Common mistake: Skipping autolyse → dough snaps back when stretching

⏱ 20 minutes

2

Add starter, salt, and oil

Add starter, salt, and olive oil. Mix with a dough scraper until incorporated. For small doughs, fold-and-turn 2–3 times instead of intensive kneading.

✓ Visual check: Evenly mixed dough with slight tackiness

⏱ 10 minutes

3

Bulk ferment

Let the dough ferment at room temperature. Do two gentle folds at 30 and 60 minutes to build structure without tightening the dough. For more flavor and easier handling, proceed with the overnight cold proof option [2].

✓ Visual check: Dough has risen slightly and shows small bubbles

⏱ 1.5–2 hours (same-day) or 12–18h (cold proof)

4

Divide and rest

Divide into portions (4 or 2). Lightly oil and cover to prevent skinning. Rest 15–30 minutes to relax gluten — this makes stretching to paper-thin easier [1].

✓ Visual check: Dough relaxed, slightly puffy

⏱ 15–30 minutes

5

Stretch and top

On a lightly floured surface or on parchment paper, stretch each portion into a thin round or rectangle using your hands. Transfer with the parchment onto a peel or baking sheet. Spread a thin layer of crème fraîche, season with nutmeg, top with onions and bacon.

✓ Visual check: Dough stretched very thin with some visible bubbles
💡 If dough springs back, rest 10 minutes then continue

⏱ 10 minutes

6

Bake

Preheat oven to the highest possible temperature (ideally 500–550°F / 260–290°C) with a baking steel or stone inside. Slide flammkuchen (on parchment paper) onto hot surface. Bake 6–10 minutes until edges blister and toppings are lightly browned. For home ovens a convection setting helps; a Dutch oven is NOT necessary for this thin flatbread but can be used to replicate intense radiant heat in small ovens [1][2].

✓ Visual check: Blistered, golden-brown edges and set toppings

⏱ 6–10 minutes

7

Serve

Use a dough scraper or peel to remove. Serve hot. Crispness is best fresh; reheat briefly in a hot oven to revive.

✓ Visual check: Crust is crisp and toppings warm

⏱ Immediate

Tips & Variations

Variations

Vegetarian

Replace bacon with thinly sliced mushrooms or smoked tofu

→ Savory, similar texture with less fat

Cheese finish

Sprinkle grated Gruyère or Emmental in last 1–2 minutes

→ Adds richness and a slight melt

Herb & garlic

Mix minced garlic and chopped chives into the crème fraîche

→ Fresh aromatic lift

Pro Tips

  • 💡 Use a digital kitchen scale for consistent portions.
  • 💡 A hot baking steel gives faster oven spring; preheat for at least 45 minutes.
  • 💡 Stretch on parchment paper to move flammkuchen quickly to the oven.

Common Issues

Common issues and quick fixes:

Storage

Room temp (short term)

Same day

Keep uncovered after cooling to avoid steam softening crust

Reheat

Within 24 hours

Re-crisp in a preheated oven at 220°C / 430°F for 3–5 minutes

Freezing

1 month

Freeze baked slices flat between parchment, reheat from frozen

⚠️ Avoid long refrigeration — it softens and stale the crisp crust due to moisture transfer [1].

Sources

  1. [1]
    The Perfect Loaf – The Perfect Loaf – Link
  2. [2]
    Plötzblog – Plötzblog – Link