My GoTo Quiche and Crust Recipe Lorraine Perfection

Ingredients

• 1 ½ cups (190g) all-purpose flour, plus extra for dusting
• ½ teaspoon (3g) salt
• ½ cup (115g) unsalted butter, very cold, cut into small cubes
• ¼ cup (60ml) ice water, plus more if needed
• 1 large egg yolk (for egg wash, optional)
• 6 ounces (170g) bacon lardons, or thick-cut bacon, diced
• 1 tablespoon (15ml) olive oil
• 1 medium onion, finely chopped
• 4 large eggs
• 1 ½ cups (355ml) heavy cream
• ½ cup (115ml) whole milk
• ¼ teaspoon (1g) ground nutmeg
• ¼ teaspoon (1g) black pepper
• 1 cup (115g) Gruyère cheese, shredded (or Emmental, if you're feeling Swiss!)