Hermine's Salmon & Leek, and Spinach & Mushroom Quiches recipe - The Great British Bake Off

Ingredients

• 500g plain flour, plus extra for dusting
• ½ tsp salt
• 200g unsalted butter, cubed and chilled
• 100g vegetable shortening, cubed and chilled
• 2 large eggs, beaten
• 20g unsalted butter
• 2 shallots, finely diced
• 2 tsp Dijon mustard
• 1 vegetable stock cube, crumbled
• 200ml double cream
• 4 large eggs, beaten
• 125g grated gruyère cheese
• Salt and freshly ground black pepper
• 2 small leeks, trimmed and thinly sliced
• 175–200g lightly smoked raw salmon fillets, cut into 1cm dice
• 200g shiitake mushrooms, halved
• 200g baby spinach leaves