This is the best way to cook beef fillet. The salt and thyme penetrate the meat, giving it a wonderful aroma and flavour. Crack it open in front of your guests for a dramatic effect.
Make the salt crust. In a large bowl combine the thyme, salt, egg and 100 ml water. Mix well and gradually add the flour, until a firm, elastic dough is formed. If it’s too dry, add a touch more water. If it’s too wet, add a little more flour. Cover with cling film and leave at room temperature for 1 hour.