Onion Custard Pie

1. Prepare and Chill Dough

Roll out the pie dough to a 12-inch round and line a 9-inch tart or pie pan with the dough, folding and pressing the edges to fit snugly. Prick the bottom with a fork and chill for at least an hour.

2. Pre-bake Dough

Preheat the oven to 375°F. Pre-bake the chilled dough with foil or parchment paper and pie weights for 15 minutes, remove the weights and foil, and bake for an additional 5 to 7 minutes until light golden brown.

3. Caramelize Onions

Melt butter in a skillet over medium heat. Add sliced onions with a pinch of salt and some freshly ground black pepper, cooking for 20 to 30 minutes until caramelized.

4. Prepare Custard Mixture

Whisk together half-and-half, eggs, and egg yolks in a mixing bowl. Stir in grated Gruyère cheese, along with a pinch of salt, freshly ground black pepper, and a hint of cayenne.

5. Assemble and Bake Pie

Spread caramelized onions over pre-baked crust. Pour custard mixture on top. Bake in preheated oven for 35 to 40 minutes until custard sets and top is golden brown.