Pork in shirtsleeves from Salt is Essential by Shaun Hill

Ingredients

• 2 pork fillets
• 2 tablespoons wholegrain mustard
• 600 g butter puff pastry
• 1 egg, beaten, for eggwash
• 2 tablespoons olive oil
• 1 small onion, finely chopped
• 2 garlic cloves, crushed
• 3 rashers of unsmoked streaky bacon, chopped
• 150 g button mushrooms, finely chopped
• 1 tablespoon double cream
• Salt and freshly ground black pepper
• 2 eggs
• Vegetable oil
• 250 ml whole milk
• 100 g plain flour