Christmas Cheese and Onion Quiche (UK)

Shortcrust Pastry

• 200 g plain flour
• 100 g unsalted butter cold, diced
• 60 g water chilled
• 1 pinch fine sea salt

Cheese and Onion Filling

• 200 g onions quartered
• 25 g olive oil
• 200 g cheese mixed variety, cut in pieces (2-3 cm)
• 150 g double cream
• 4 medium eggs
• ½ tsp fine sea salt
• ¼ tsp ground black pepper