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### **Instructions:**
1. **Make the Pastry:**
– In a food processor, combine flour, salt, and butter. Pulse until the mixture resembles breadcrumbs.
– Add the egg yolk and gradually add ice water, 1 tablespoon at a time, until the dough just comes together.
– Turn the dough onto a floured surface and knead briefly until smooth. Wrap in plastic wrap and refrigerate for 30 minutes.
2. **Prepare the Filling:**
– Cook the sliced potatoes in boiling salted water for about 7-8 minutes until tender but firm. Drain and set aside.
– In a large pan, heat olive oil over medium heat. Add the onions and sauté until they caramelize (about 20-25 minutes). Stir occasionally until golden brown and sweet.
– Season the potatoes and onions with salt, pepper, and herbs.
3. **Assemble the Pie:**
– Preheat your oven to 375°F (190°C).
– Roll out the pastry dough and fit it into a 9-inch pie pan. Press it gently into the edges.
– Layer the potatoes, followed by the caramelized onions and grated cheese. Repeat if necessary, creating layers of each.
– Cover the pie with a second layer of pastry, trimming the edges. Brush with an egg wash and make a few slits in the top for ventilation.
4. **Bake:**
– Bake the pie for 30-35 minutes or until the pastry is golden brown and the filling is bubbly.
– Let the pie cool for 10-15 minutes before serving.
### **Serving Suggestions:**
Cheese, Onion, and Potato Pie can be served as a standalone meal or with a side salad, roasted vegetables, or pickles. It pairs wonderfully with a glass of crisp white wine or a cold beer, making it an excellent dish for any occasion.
## **Variations and Customizations**
While the basic recipe for **Cheese, Onion, and Potato Pie** is satisfying on its own, you can easily customize the pie to suit your tastes and dietary preferences. Here are a few ideas:
– **Add Bacon or Ham**: For
