Mix the salt, egg white, water and thyme and place in a heat proof dish or tinfoil parcel so that it is 3cm deep.
Wash and piece the skin of the apples and pears at the top of the fruit using a small knife or cocktail stick.
Arrange the apples and pears sitting upright in the salt, they are now ready for the BBQ.
To cook the apples and pears brush them with oil. Cook for 15-30 minutes depending on the heat from your barbecue.