Nadiya Hussain's Wellington sausage rolls recipe

Ingredients

• 30 g unsalted butter
• 100 g mushrooms, finely chopped
• 1 tbsp Worcestershire sauce
• 1 tbsp Tabasco, or less if you prefer, depending on your tolerance for heat
• 6 large beef sausages, taken out of the skins
• 1 pinch fine sea salt
• 1 freshly ground black pepper
• 1 plain flour, for dusting
• 450 g puff pastry (shop bought, or you can make your own)
• 4 tbsp wholegrain mustard
• 1 medium egg, beaten
• 1 sea salt flakes, to sprinkle