Flammkuchen: Alsace's Crispy Crème Fraîche Flatbread

What Is Flammkuchen?

Flammkuchen (German) or tarte flambée (French) is a thin-crust flatbread from the Alsace region – the borderland between France and Germany. Traditionally baked in the residual heat of a wood-fired bread oven (hence "flame cake"), it's topped with crème fraîche, thinly sliced onions, and lardons.

The Dough: Two Schools

Yeast dough (traditional bakery style):

• 55–60% hydration
• Small amount of yeast
• 1–2 tablespoons olive oil
• Short ferment (1–2 hours)

No-yeast dough (home style):

• Flour, water, oil, salt – mixed into a smooth, pliable dough
• No rising time needed
• Slightly crisper result, more cracker-like

Both approaches work. The traditional yeast version has a touch more chew; the quick version is crispier and faster.

Shaping

• Roll as thin as possible – 1–2mm is the target
• Rectangular or oval shapes are traditional (not round)
• The dough should be almost translucent when held up to light
• Dust the work surface with flour to prevent sticking

The Classic Topping

The beauty of Flammkuchen is its minimalism:

Crème fraîche (or a mix of crème fraîche and fromage blanc) – spread thin

White onions – sliced into very thin rings

Lardons/Speck – small pieces of smoked bacon

Season with nutmeg and white pepper (not black pepper!)

That's it. No tomato sauce. No mozzarella. The crème fraîche IS the sauce.

Baking

• Wood-fired oven: 350°C+, 2–3 minutes (the original method)
• Home oven: Maximum temperature (250–280°C), directly on a pizza stone, 8–12 minutes
• Done when: Edges are deeply browned and curling, base is crispy, crème fraîche is bubbling

Variations

• Gratinée: Add Gruyère or Münster cheese
• Forestière: Mushrooms and herbs
• Sweet: Apple slices, cinnamon, and sugar (an Alsatian dessert tradition)
• Modern: Smoked salmon, horseradish cream, capers