Tarte aux Oignons
A classic Alsatian savory tart with caramelized onions, crème fraîche, and crispy pastry. Rich, deeply flavored, and elegant enough for a dinner party.
- Total time
- 75 min
- Servings
- 6
- Calories
- 520
- Protein
- 12g
Ingredients
- 1.25 cups all-purpose flour
- ½ cup cold butter, cubed
- 1 egg yolk
- 1 pinch salt and pepper
- 2 lbs yellow onions, sliced thin
- 1 cup crème fraîche
- 2 eggs
- ¼ tsp whole nutmeg, freshly grated
- 4 oz smoked bacon, diced
- 2 sprigs fresh thyme
- 2 tbsp olive oil
Instructions
- 1
Mix flour and salt. Cut in cold butter until mixture resembles coarse breadcrumbs.
- 2
Add egg yolk and 3 tablespoons cold water. Mix until dough just comes together.
- 3
Wrap in plastic and chill 30 minutes.
- 4
Heat olive oil in a large skillet over medium. Add onions, thyme, salt, and pepper.
- 5
Cook 40–50 minutes, stirring occasionally, until onions are deeply golden and sweet.
- 6
Remove thyme. Taste and adjust seasoning.
- 7
Preheat oven to 400°F. Roll pastry into a 10-inch tart pan; prick base with a fork.
- 8
Bake blind 8 minutes until just set; remove from oven and reduce heat to 375°F.
- 9
Cook bacon in a small skillet until crisp, ~5 minutes. Drain on paper towels.
- 10
Whisk crème fraîche, eggs, nutmeg, salt, and pepper in a bowl until smooth.
- 11
Spread caramelized onions in pastry shell. Pour custard over. Scatter bacon on top.
- 12
Bake 25–30 minutes until custard is set but slightly jiggly in the center.
- 13
Cool 10 minutes. Slide onto a plate and serve warm or at room temperature.
Tools you’ll need
- 9-inch tart pan with removable bottom
- large skillet
- small skillet
- rolling pin
- whisk
- mixing bowl
- paper towels
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