Spinach, Penne And Cheese Spoufflé

ingredients

• 300ml whole milk
• 1 bay leaf
• ½ onion
• A few black peppercorns
• 100g penne or similar shaped pasta
• 250g spinach, any tough stalks removed
• 50g unsalted butter, plus extra for greasing
• 50g plain flour
• 75g mature Cheddar, finely grated
• A little freshly grated nutmeg
• 3 large eggs, separated, plus 1 extra egg white
• Sea salt
• freshly ground black pepper