Ingredients
Method
Make the Crust
- In a large bowl, whisk together flour and salt. Add cold butter cubes and use a pastry cutter or your fingers to work the butter into the flour until mixture resembles coarse crumbs with some pea-sized pieces.
- Sprinkle 3 tablespoons ice water over the mixture and use a fork to toss until dough starts to come together. Add more water if needed. The dough should hold together when squeezed but not be wet.
- Turn dough onto a lightly floured surface and gently knead 2-3 times until it comes together. Shape into a disk, wrap in plastic, and refrigerate for at least 1 hour.
- Roll out chilled dough on a floured surface to a 12-inch circle. Transfer to a 9-inch pie pan and trim edges, leaving a 1-inch overhang. Fold overhang under and crimp edges. Prick bottom all over with a fork and refrigerate 30 minutes.
Blind Bake the Crust
- Preheat oven to 425°F. Line chilled pie crust with parchment paper and fill with pie weights or dried beans.
- Bake 15 minutes, then remove weights and parchment. Brush bottom and sides with beaten egg and bake 5 more minutes until lightly golden. Remove from oven and reduce temperature to 350°F.
Prepare the Filling
- In a large skillet, melt butter over medium heat. Add sliced onion and cook 8-10 minutes until soft and lightly caramelized. Remove from heat and let cool slightly.
- In a large bowl, whisk together whole eggs, egg yolks, cream, milk, salt, white pepper, and nutmeg until smooth.
- Scatter cooked onions over the bottom of the pre-baked crust. Top with torn smoked salmon pieces and grated Gruyère.
- Pour custard mixture over filling and sprinkle with chopped chives.
Bake the Quiche
- Carefully transfer quiche to oven and bake 35-40 minutes until center is just set and top is lightly golden. A knife inserted in center should come out mostly clean.
- Cool on a wire rack for at least 15 minutes before slicing. Serve warm or at room temperature.
Notes
Quiche can be made up to 1 day ahead and reheated gently in a 300°F oven. For best results, use high-quality smoked salmon and freshly grated cheese. The custard should still have a slight jiggle in the center when you remove it from the oven, as it will continue cooking from residual heat.
