Description
This French Onion Galette combines all the rich, savory flavors of French onion soup—caramelized onions, Gruyère cheese, and flaky pastry—into a rustic, free-form tart. Perfect as an appetizer, side dish, or vegetarian main.
Ingredients
- 1 sheet puff pastry, thawed
- 2 tbsp unsalted butter
- 2 tbsp olive oil
- 3 large yellow onions, thinly sliced
- 1 tsp kosher salt
- 1/2 tsp black pepper
- 1 tsp sugar
- 1 tbsp balsamic vinegar
- 1 tbsp fresh thyme leaves
- 1 cup shredded Gruyère cheese
- 1 egg, beaten (for egg wash)
- Flaky sea salt, for garnish
Instructions
- Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
- Heat butter and olive oil in a large skillet over medium heat. Add the sliced onions, salt, pepper, and sugar. Cook, stirring occasionally, until onions are deeply golden and caramelized, about 30-40 minutes.
- Deglaze the pan with balsamic vinegar and stir in fresh thyme. Remove from heat and let cool slightly.
- Roll out the puff pastry on a floured surface into a 10-12 inch round. Transfer to the prepared baking sheet.
- Sprinkle half of the Gruyère cheese in the center, leaving a 2-inch border. Top with caramelized onions, then the remaining cheese.
- Fold the edges of the pastry over the filling, pleating as needed. Brush the crust with the beaten egg.
- Bake for 25-30 minutes, or until the crust is golden and the cheese is bubbly.
- Let the galette cool slightly before slicing. Sprinkle with flaky sea salt and serve warm or at room temperature.
Notes
- Make ahead by caramelizing onions in advance and storing in the fridge.
- Can substitute Gruyère with Swiss or Fontina cheese.
- Serve with a green salad for a complete meal.
- Store leftovers in the fridge and reheat in oven for best texture.
- Prep Time: 20 minutes
- Cook Time: 40 minutes
- Category: Appetizer
- Method: Baking
- Cuisine: French
Nutrition
- Serving Size: 1 slice (1/6 of galette)
- Calories: 290
- Sugar: 4g
- Sodium: 390mg
- Fat: 20g
- Saturated Fat: 10g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 22g
- Fiber: 2g
- Protein: 7g
- Cholesterol: 45mg
