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Flammkuchen, also called tarte flambée, is an Alsatian specialty that delivers maximum flavor with minimal fuss. A thin, crispy crust is topped with creamy crème fraîche, thin strips of bacon, and caramelized onions, then baked until the edges are golden and the filling is warm and slightly bubbling. It’s restaurant-quality comfort food that comes together in under an hour, even with a from-scratch dough.
What is flammkuchen?
Flammkuchen (or tarte flambée, in French) is a thin-crust tart from the Alsace region of France. It’s traditionally made with a yeasted dough, stretched paper-thin, and topped with a simple trilogy: crème fraîche, bacon or lardons, and thinly sliced onions. A quick, high-heat bake turns the crust crispy and the toppings warm and savory. It’s often served as an appetizer or light main course.
Why you’ll love it
- Ready in 30 minutes with simple, accessible ingredients—no special skills required
- The contrast of crispy crust, creamy crème fraîche, and caramelized onions is irresistibly savory
- Elegant enough for entertaining, casual enough for a weeknight dinner
Ingredients (serves 4)
| Ingredient | Amount | Where to find it / Substitutes |
|---|---|---|
| All-purpose flour | 250 g (2 cups) | Pantry staples |
| Instant or active dry yeast | 7 g (2.25 tsp) | Baking aisle; or 5 g if using instant yeast |
| Warm water | 150 ml (0.6 cup) | Tap water, 40℃ (105℉) |
| Salt | 5 g (1 tsp) | Pantry staples |
| Olive oil | 2 tbsp | Pantry staples |
| Crème fraîche (or sour cream) | 200 g (0.75 cup) | Dairy aisle; room temperature |
| Bacon or lardons, thinly sliced | 150 g (5 oz) | Meat counter; or use smoked pancetta |
| Yellow onions, thinly sliced | 3 medium | Produce section |
| Black pepper, nutmeg | To taste | Pantry staples |
Allergens: Wheat (flour); dairy (crème fraîche); pork (bacon, lardons). Bacon must be fully cooked through, no pink remaining.
How to make it
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Make the dough: In a large bowl, combine the warm water and yeast, and let sit for 5 minutes until foamy. Add the flour, salt, and olive oil. Mix until a shaggy dough forms, then knead by hand for 8–10 minutes (or use a stand mixer with the dough hook for 5–6 minutes) until smooth and elastic. Cover with a damp cloth and let rise in a warm place for 45–60 minutes, or until doubled in size.
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Prepare the bacon and onions: While the dough rises, heat a large skillet over medium heat. Add the bacon slices and cook for 5–7 minutes, stirring occasionally, until crispy. Remove with a slotted spoon and set aside on paper towels. In the same skillet, add the sliced onions and cook over medium heat for 15–20 minutes, stirring occasionally, until deeply caramelized and soft. Season with salt and pepper.
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Stretch the dough: Preheat the oven to 220℃ (425℉). Divide the dough in half or quarters, depending on how many tarts you’re making (one tart feeds 2–3 people). On a floured surface, stretch or roll each piece of dough as thin as possible, about 2 mm (1/16 inch)—the thinner, the crispier. Transfer to a baking sheet or pizza stone.
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Assemble: Spread a thin, even layer of crème fraîche over each dough round, leaving a thin border. Scatter the crispy bacon pieces and caramelized onions evenly over the top. Season lightly with black pepper and a tiny grating of nutmeg.
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Bake: Place in the preheated oven and bake for 12–15 minutes, until the crust is golden and crispy at the edges and the crème fraîche is warm and slightly bubbling.
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Serve: Remove from the oven and let cool for 1–2 minutes. Serve warm, cut into wedges.
Tips for success
- Stretch the dough thin: The signature appeal of flammkuchen is its crispy, paper-thin crust. Don’t be afraid to stretch it as thin as you can—it won’t tear.
- Use room-temperature crème fraîche: Cold crème fraîche is harder to spread. Let it sit on the counter for 15 minutes before assembling.
- Don’t overload the toppings: A thin, even layer of crème fraîche and a modest amount of bacon and onions allow the crust to crisp up properly. Too many toppings make it soggy.
- Caramelize the onions properly: Sweet, deep-golden onions are essential. Don’t rush; take 15–20 minutes. The sweetness balances the savory bacon and cream.
- Use a pizza stone for extra crispness: If you have one, preheat a pizza stone in the oven and bake directly on it for an even crispier bottom.
Variations / Storage
- Vegetarian flammkuchen: Omit the bacon and double the caramelized onions, or add sautéed mushrooms and fresh thyme.
- With fresh herbs: Top with fresh chives or thyme after baking for a bright herbaceous note.
- Smoked salmon version: Replace the bacon with thin slices of smoked salmon and add a small dollop of crème fraîche and fresh dill before serving.
- Cheese addition: Scatter a small amount of grated Emmental or Alsatian Munster cheese over the crème fraîche before adding bacon and onions.
- Storage: Flammkuchen is best eaten fresh and warm. Leftovers can be wrapped and refrigerated for up to 2 days — storage life varies with conditions. Reheat in a 180℃ (350℉) oven for 8–10 minutes, though the crust will soften slightly.
FAQ
Q. Can I make the dough ahead of time?
A. Yes—prepare the dough through the first rise, then refrigerate it in an airtight container for up to 24 hours. Let it come to room temperature for 20–30 minutes before stretching.
Q. What’s the difference between flammkuchen and pizza?
A. Flammkuchen has a thinner, crispier crust and simpler toppings. The dough uses less yeast and benefits from a thin, even layer of crème fraîche rather than cheese and tomato sauce.
Q. Can I use store-bought pizza dough?
A. Yes—if short on time, use a 500 g (1 lb) ball of store-bought pizza dough. Stretch it thin and top as directed; reduce baking time slightly since it may be thinner than homemade.
Q. What if I can’t find crème fraîche?
A. Sour cream or Greek yogurt works as a substitute, though the flavor will be slightly tangier and less rich. Spread it on just before baking.
Q. Why is my crust soggy instead of crispy?
A. The toppings may be too wet or too abundant, or the oven temperature isn’t high enough. Use less crème fraîche, ensure the bacon and onions are dry, and verify your oven is fully preheated to 220℃ (425℉).
