French Onion Galette
Transform your savory cravings into this golden, caramelized French Onion Galette with Gruyère cheese and mustard.
Ingredients
- 8 tbsp (1 stick) cold unsalted butter
- 1 1/2 cups all-purpose flour
- 1 tsp freshly ground black pepper
- 1/2 tsp kosher salt
- 1/4 cup + 3 tbsp ice water
- 3 pounds yellow onions (about 3 large or 6 medium)
- 10 sprigs fresh thyme
- 3 tbsp unsalted butter (for filling)
- 1 tsp kosher salt (for filling)
- 1/2 tsp freshly ground black pepper (for filling)
- 6 oz Gruyère cheese
- 1/4 cup dry white wine
- 2 tsp balsamic or sherry vinegar
- 2 tsp Dijon mustard
Instructions
- Make the crust: Freeze butter for 15 minutes, then grate it and mix with flour and pepper. Add ice water and form dough. Refrigerate for 1 hour.
- Prepare the filling: Slice onions and cook with thyme, salt, and pepper until golden brown, about 45-60 minutes. Add wine and vinegar to deglaze.
- Assemble the galette: Preheat oven to 400°F. Roll out the dough on parchment, spread Dijon mustard, sprinkle half the cheese, then layer caramelized onions. Fold dough edges over, sprinkle with remaining cheese.
- Bake: Bake for 35 minutes until the crust is golden-brown and cheese is bubbly. Let cool for 10 minutes before serving.